Work around a reported locale problem.

I've not been able to reproduce the problem here.
Load the RSA key just before it's needed.

This fixes auth problems when connecting to a server after playing locally.
Fix the regexp used for validating the md5sums file.
Fix handling of fully-specified source URLs.
Fail sooner if downloading the md5sum file fails.
If downloading any of the listed files fails, continue with the next one.
Changelog update.
Fix null pointer dereference
fix: 'nix, don't make assumptions on display name
Merge branch 'master' into debian
Update debian/changelog.
Include opus in the stripped tarball – may not be in current distributions.
Quick fix for i386/gcc(ish) build breakage.
Shader for new arm/hand textures for weapons.
Merge branch 'master' of github.com:Unvanquished/Unvanquished
Change RE_SetColorGrading to use the renderer command list

It is not efficient to make OpenGL calls from the main thread with smp enabled
Use R_SyncRenderThread in more places
Reduce the number of calls to GLimp_SetCurrentContext()

GLimp_FrontEndSleep only needs to block until the renderer thread is finished, it does not need to acquire the OpenGL context.
Fix crash with SMP enabled
CMakeList: add USE_SMP back to be able to test it