Worked out fine so far, because the next line was empty, but this can
easily change...

Cherry-picked from Arctica GH 3.6.x branch.

Prevents random characters as being treated as part of a variable name.

Cherry-picked from Arctica GH 3.6.x branch.

Cherry-picked from Arctica GH 3.6.x branch.

Fixes potential bugs, including one triggered by an unquoted hash within
the command line. BASH accepts this. Other shells do not (i.e., treat
everything following the hash character as a comment.)

Cherry-picked from Arctica GH 3.6.x branch.

Conflicts:
    debian/roll-tarballs.sh

debian/roll-tarballs.sh: fix tarball creation in lite mode: do not try to fixup NX-X11 directory (it won't be there.)

Unify source tree reduction (debian/rules vs. roll-tarball.sh) via file/folder lists in text files named debian/CODE-REDUCTION_*.

debian/roll-tarball.sh: Install etc/ files into etc/ subfolder (rgb, nxagent.keyboard, x2goagent.keyboard).

  * Debian/Ubuntu packaging:
    + Fully rework the way nx-libs gets packaged for Debian/Ubuntu.
    + Split up libnx-x11 into individual packages.
    + Provide dbg:packages for each bin:package containing binaries.
    + Use Makefile logic to install files into DESTDIR.
    + Provide dev:packages for each lib:package individually.
    + Provide nx-x11proto-*-dev packages for all libnx-* libraries.
    + Install _all_ library files (*.so*) to /usr/lib/<triplet>/, so
      no extra settings of LD_LIBRARY_PATH is necessary.

More source tree size reduction by analyzing what exactly of the Mesa source code in nx-X11/extras/ is used and what not.

* Drop more unused folders from tarball release / before .deb package build:
    - nx-X11/programs/Xserver/miext/shadow/
    - nx-X11/programs/Xserver/XpConfig/
    - nx-X11/programs/Xserver/Xprint/

Drop nx-X11/programs/Xserver/hw/xfree86 except of four files symlinked to other locations in the source tree at build time.

Drop more unused code in nx-X11/programs/Xserver/hw/. Do this in roll-tarball.sh and in debian/rules alike.

Add 400_nxcomp-version.full+lite.patch. Allow 4-digit version comparison during NX session handshake. (Fixes: #610).

Improve patch: 601_nx-X11_build-option-changes-to-not-use-bundled-libraries.full.patch. Improvements taken from the current Fedora package. Thanks to Orion Paplowski!!! Also adapt roll-tarball.sh do dropping more bundled libraries.

Change build options so that bundled libraries are not used anymore at build time. Remove bundled libraries from rolled tarballs, as well. (Fixes: #116, #238).

  + Only install keystrokes.cfg when in full mode.
  + Only install nxproxy wrapper when in lite mode.

Provide a default keystrokes.cfg in /etc/nx (for nxagent) and /etc/x2go (for x2goagent). (Fixes: #199).

Work-in patch from Jan Engehardt for working around different improper bash implementations of string-in-string replacing. (Fixes: #145).

No longer add them as quilt patch, as they are much easier to edit this
way. This, of course, requires adjustments to the roll-tarballs.sh script