"nx-X11 Agent" looks and sounds ugly.

Attributes GH PR #434: https://github.com/ArcticaProject/nx-libs/pull/434

nx-libs.spec: sync up RPM builds after Xext proto change in a51cb945.

debian/{rules,nx-x11proto-xext-dev}: More Xext header files belong int nx-x11proto-xext-dev (instead of removing them in debian/rules).

debian/control: Pull-over latest changes on these files from the official Debian package. Various improvements several package descriptions.

Attributes GH PR #421: https://github.com/ArcticaProject/nx-libs/pull/421

 Fixes ArcticaProject/nx-libs#80

Attributes GH PR #428: https://github.com/ArcticaProject/nx-libs/pull/428

Makefile: Make sure that 'make all' only calls 'make build' and _not_ the global '%:' ruleset afterwards.

Attributes GH PR #426: https://github.com/ArcticaProject/nx-libs/pull/426

Attributes GH PR #425: https://github.com/ArcticaProject/nx-libs/pull/425

 - Move FONT_DEFINES and XLIBFONT definition to from Server.tmpl to
   Imake.tmpl.
 - Add FONT_DEFINES to ALLDEFINES.
 - Drop SpecialCObjectRules with FONT_DEFINES from various Imakefiles
   again, FONT_DEFINES is now set "globally".
 - Hand over FONT_DEFINES from main Makefile to nx-X11's make BuildEnv
   to make gccmakedep happy.

Attributes GH PR #410: https://github.com/ArcticaProject/nx-libs/pull/410

 Backported from X.org:

 commit f797c96845a3fab37cda6839ebecf9ac5401fd6e
 Author: Aaron Plattner <aplattner@nvidia.com>
 Date:   Thu Nov 15 12:12:02 2007 -0800

    Save pixmap allocation hints into the PixmapRec.
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 Backported from X.org:

 commit f2e310132fbe1520c1b5f3da4faa2d2d47835e72
 Author: Aaron Plattner <aplattner@nvidia.com>
 Date:   Wed Oct 31 14:15:35 2007 -0700

    Add CreatePixmap allocation hints.

    These hints allow an acceleration architecture to optimize allocation of certain
    types of pixmaps, such as pixmaps that will serve as backing pixmaps for
    redirected windows.
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Attributes GH PR #362: https://github.com/ArcticaProject/nx-libs/pull/362