Xpra

* fix missing key frames with x264/vpx: always reset the video encoder when we skip some frames (forces a new key frame)
* fix server crash on invalid keycodes (zero or negative)
* fix latency: isolate per-window latency statistics from each other
* fix latency: ensure we never record zero or even negative decode time
* fix refresh: server error was causing refresh requests to be ignored
* fix window options handling: using it for more than one value would fail
* fix video encoder/windows dimensions mismatch causing missing key frames
* fix damage options merge code (options were being squashed)
* ensure that small lossless regions do not cancel the auto-refresh timer
* restore protocol main packet compression and single chunk sending
* drop unnecessary OpenGL dependencies from some deb/rpm packages

* fix compress clipboard data (previous fix was ineffectual)
* fix missing damage data queue statistics (was causing latency issues)
* use memory aligned allocations for colourspace conversion

* fix launcher: don't block the UI whilst connecting, and use a lower timeout, fix icon lookup on *nix
* fix clipboard contents too big (was causing connection drops): try to compress them and just drop them if they are still too big
* x264 or vpx are now the default encodings (if available)
* compress rgb24 pixel data with zlib from the damage thread (rather than later in the network layer)
* better build environment detection
* experimental multi-user support (see --enable-sharing)
* better, more accurate "xpra info" statistics (per encoding, etc)
* tidy up main source directory
* simplify video encoders/decoders setup and cleanup code
* many debian build files updates
* remove 'nogil' switch (as 'nogil' is much faster)
* test all socket types with automated tests

* fix man page typo
* fix non bash login shell compatibility
* fix xpra screenshot argument parsing error handling
* fix video encoding mismatch when switching encoding
* fix ssh mode on OpenBSD

* zlib compatibility fix: use chunked decompression when supported (newer versions)

* fix xpra launcher icon lookup on *nix
* fix big clipboard packets causing disconnection: just drop them instead
* fix zlib compression in raw packet mode: ensure we always flush the buffer for each chunk
* force disconnection after irrecoverable network parsing error
* fix window refresh: do not skip all windows after a hidden one!
* Fedora 16 freshrpms spec file fix: build against rpmfusion despite more limited csc features