{nx-X11/programs/Xserver/hw/nxagent/{{Args,Handlers,Image,Options}.c,Options.h},nxcomp/{Loop,Misc}.cpp}: add configurable sleep delay if session is suspended.

nx-X11/programs/Xserver: Include nxcomp{,ext,shad} headers like one would do with system-wide shared libraries.

nxcomp/Makefile.in: Only install MD5.h, NX.h, NXalert.h, NXpack.h, NXproto.h and NXvars.h as publicly available header files.

 * Also adapt debian/libxcomp-dev.install.in accordingly.
 * Also adapt nx-libs.spec accordingly.

Fix debugging function for Loop.cpp. getDebugSpec was replaced by << operand in ChannelEndPoint.{h|cpp}, fixes #130

This commit removes several warnings in nxcomp related to unused but
set variables. It also replaces tempnam function with the more secure
one mkstemp and there has been removed another warning related to
setgid and setuid returning values not being checked.

So these were the compiler warnings in nxcomp that have been fixed:

Loop.cpp: In function ‘int ParseRemoteOptions(char*)’:
Loop.cpp:9423:7: warning: variable ‘hasLimit’ set but not used [-Wunused-but-set-variable]
   int hasLimit  = 0;
       ^
Loop.cpp:9424:7: warning: variable ‘hasRender’ set but not used [-Wunused-but-set-variable]
   int hasRender = 0;
       ^
Loop.cpp:9425:7: warning: variable ‘hasTaint’ set but not used [-Wunused-but-set-variable]
   int hasTaint  = 0;
       ^
Loop.cpp:9427:7: warning: variable ‘hasStrict’ set but not used [-Wunused-but-set-variable]
   int hasStrict = 0;
       ^
Loop.cpp:9428:7: warning: variable ‘hasShseg’ set but not used [-Wunused-but-set-variable]
   int hasShseg  = 0;
       ^
ServerChannel.cpp: In member function ‘virtual int ServerChannel::handleWrite(const unsigned char*, unsigned int)’:
ServerChannel.cpp:2132:9: warning: variable ‘hit’ set but not used [-Wunused-but-set-variable]
     int hit;
         ^
Proxy.o: In function `Proxy::handleSaveAllStores(char const*) const':
Proxy.cpp:(.text+0x2cac): warning: the use of `tempnam' is dangerous, better use `mkstemp'

Pipe.cpp: In function ‘FILE* Popen(char* const*, const char*)’:
Pipe.cpp:240:23: warning: ignoring return value of ‘int setgid(__gid_t)’,
declared with attribute warn_unused_result [-Wunused-result]
       setgid(getgid());
                       ^
Pipe.cpp:241:23: warning: ignoring return value of ‘int setuid(__uid_t)’,
declared with attribute warn_unused_result [-Wunused-result]
       setuid(getuid());
                       ^

There was also a hidden problem in the way Proxy::handleSaveAllStores was
checking for an error in the returning value from the call to the virtual
method handleSaveAllStores of the specific proxy class really being used
(ClientProxy or ServerProxy).

Former code was considering the value 0 as the returning value in case of
an error whereas both subclasses return the value -1 when there is an error
in their handleSaveAllStores method.

This bug has been fixed in this commit taking advantage of the modification
that was already being made to this method in order to replace tempnam
function with the more secure one mkstemp.

Fixes: ArcticaProject/nx-libs#103

It was GPL3 instead of GPL2!

Fixes ArcticaProject/nx-libs#112

This commit removes TextCompressor class references from ClientCache
and ServerCache as it's no longer used after removing old protocol's
compatibility code from nxcomp. It also removes the attribute textCache
from both classes as it's no longer used either.

Finally the header and source files associated with the TextCompressor
class are also deleted and removed from the compilation process.

Refs: ArcticaProject/nx-libs#108

This commit removes obsolete compatibility files whose components were
only used to handle compatibility with old protocol versions that are
no longer supported.

Refs: ArcticaProject/nx-libs#108

As a part of nxcomp's clean-up process, compatibility with old protocol
versions has been set now at 3.5.0.

This commit removes compatibility code from nxcomp so the minimum supported
version changes from 1.5.0 (protocol step 6) to 3.5.0 (protocol step 10).

At this moment the removal is not complete and it will be followed by some
other commits, in order to get rid of several components and files that are
no longer used as they were only needed to work with old protocol versions.

Refs: ArcticaProject/nx-libs#108

Fixes ArcticaProject/nx-libs#104

 By design, when resuming a session, Xinerama can only be re-enabled
 by NX option parsing.

 Thus, this change introduces a "xinerama" NX option that can
 be loaded via an options file into NX agent when resuming
 a session. The new xinerame NX session option also allows
 switching on Xinerama at session startup via an option file.

 When implementing the new NX Xinerama support into clients (like
 TheQVD, X2Go Client, etc., this new xinerama NX option should be
 used for activating Xinerama in the NX / QVD / X2Go session.

Problem fixed by adding a select() call to implement a timeout,
and retrying writes if needed.

  * Update nxcomp/LICENSE.
  * Add nxcomp/README.on-retroactive-DXPC-license, giving a
    short overview of the flow of discussions
  * Add "modified or unmodified" to the license information
    printed out to stdout in nxcomp/Misc.cpp
  * Fix copyright year (2006->2003) for Gian Filippo Pinzari
    (and move him to the GPL-2 section).
  * Add the complete .mbox file of Debian bug #748565.

Problem fixed by adding a select() call to implement a timeout,
and retrying writes if needed.

Particularly the following macros have been tested -DTEST -DDEBUG -DDUMP -DFLUSH -DTOKEN -DSPLIT -DPING -DMIXED -DMATCH -DTIME

This patch allows to cleanup the nxcomp resources to allow for a second connection inside the same process, instead of a new process as is the nxproxy case.

This involves creating a new API call

void NXTransCleanupForReconnect(void);

which basically cleans up the global state for the connection but does not exit the process.

Background
==========
This is needed for the IOS platform, where the nxproxy model of forking does not work.
Also NX handles most of the errors with an "exit" call which in IOS cannot be easily handled.

nxcomp{,ext,shad}: only use the first three numbers in the full version for current_version on OS X. ld(1) on 10.6 fails otherwise.

nxcomp{,ext,shad}: use the correct library naming scheme on OS X. It differs from other UNIX-based systems.

VERSION file: master VERSION file is in base folder, symlinked from nx*/VERSION and hw/nxagent/VERSION.

  This commit removes the debian/VERSION file at makes it now unnecessary to
  copy/symlink the VERSION file at build time. These build scripts got adapted:

    debian/roll-tarballs.sh
    debian/rules
    nx-libs.spec

  Furthermore, all NX component now use the main VERSION file as reference.

    typechange: nxcomp/VERSION
    typechange: nxcompext/VERSION
    typechange: nxcompshad/VERSION
    typechange: nxproxy/VERSION