Add patch headers to all patch files, report most patches upstream. Waiting for feedback and quotable URLs from NoMachine.

  - 005_add-nxagent-wrapper.patch.
  - 008_add-nxproxy-wrapper.patch.
  - 011_add-nxauth-wrapper.patch.

Set homepage of X2Go upstream project (using http://wiki.x2go.org). Packaging Vcs has been relocated to Alioth.

Add patch: 019_nx-x11_expat-build-against-system-libxmltok.patch, fixes lintian error: embedded-library: expat. Build-depend on libxmltok1-dev.

  - libnx-x11: postinst-has-useless-call-to-ldconfig
  - libnx-x11: postrm-has-useless-call-to-ldconfig
  as they relate to a bug in debhelper (call of ldconfig although we did not
  touch any directory controlled by /etc/ld.so.conf, amongst others
  see BTS issue #205142).

Update patch: 017_nx-x11_update-autotools-helper-files.patch. Add lintian override to source.lintian-overrides: ancient-autotools-helper-file as we handle autotools helper file updates via patch system.

Add patch: 018_nx-x11_update-libtool-ltmain-script.patch. Silence lintian warning ancient-libtool via lintian override as we patch in a new version of ltmain.sh by this patch.

Add lintian-override: outdated-autotools-helper-file to source.lintian-overrides as we patch-update the outdated helper files before building binaries.

Rename patch: 008_nxproxy_add-nx-proxy-wrapper.patch to 008_nxproxy_add-nxproxy-wrapper.patch. Add patch from FreeNX patchset: 110_nxagent_createpixmap-bounds-check.patch.