roll-tarballs.sh: Remove even more files from nx-X11/extras/Mesa/. This roll-tarball.sh version has been used for generating the 3.5.99.8 tarball.

roll-tarball.sh: Fix tarball creation, now that we pull in Mesa as a git-subtree. This basically moves versioned folders around and drops the Mesa/ and Mesa.patches/ symlinks.

roll-tarball.sh: Drop various unused files from the bundled Mesa version when creating release tarballs.

roll-tarball.sh: Fix ChangeLog creation, always create ChangeLog for the CHECKOUT, not the currently checked out branch.

roll-tarballs.sh: Adapt to recent changes in nx-libs, keep legacy support for older 3.6.x and 3.5.x releases.

 Fixes ArcticaProject/nx-libs#276.

roll-tarball.sh: Don't ship doc/X11-symbols/ in the lite (proxy-only) tarball derived from the nx-libs code tree.

 The x2goagent package is being replaced by an x2goserver bin:package
 named x2goserver-x2goagent.

 This x2goserver-x2goagent bin:package will be maintained in the X2Go
 Project's namespace and basically wraps around nxagent.

 Furthermore, declare Arctica Project as upstream source for nx-libs.

 As the system a tarball gets extracted on may potentially be unable
 to handle symlinks, we ship symlinks as files in the rolled tarball.

 By transforming symlinks into real files, we also assure that all
 VERSION files/symlinks get shipped in the tarballs.

 Fixes ArcticaProject/nx-libs#27

debian/roll-tarball.sh: Rename README.md to README.NX-Development before moving it into doc/ folder.

* bin/{nxagent,nxauth,x2goagent}
* etc/
* doc/nx-X11_vs_XOrg69_patches
* README.keystrokes"
* nx-libs.spec

debian/roll-tarball.sh: Allow patch files names having a dash next to the four digits (i.e., 1234-<patchname>.<suffix>).

 As the system a tarball gets extracted on may potentially be unable
 to handle symlinks, we ship symlinks as files in the rolled tarball.

 By transforming symlinks into real files, we also assure that all
 VERSION files/symlinks get shipped in the tarballs.

 Fixes ArcticaProject/nx-libs#27

debian/roll-tarball.sh: Rename README.md to README.NX-Development before moving it into doc/ folder.

* bin/{nxagent,nxauth,x2goagent}
* etc/
* doc/nx-X11_vs_XOrg69_patches
* README.keystrokes"
* nx-libs.spec

debian/roll-tarball.sh: Allow patch files names having a dash next to the four digits (i.e., 1234-<patchname>.<suffix>).

debian/roll-tarball.sh: Make sure *.keyboard, debian/**, nx-libs.spec, .pc/** don't end up in tarball (special focuse on the nx-libs-lite tarball).

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.