Xpra

* Fix for older distros (like CentOS) with old versions of pycairo

* fix clipboard bug which was causing Java applications to crash
* ensure we always properly disconnect previous client when new connection is accepted
* avoid warnings with Java applications, focus errors, etc

* ssh password input fix
* osx dock_menu fixed
* ability to take screenshots ("xpra screenshot")
* report server version ("xpra version")
* slave windows (drop down menus, etc) now move with their parent window
* show more session statistics: damage regions per second
* posix clients no longer interfere with the GTK/X11 main loop
* ignore missing properties when they are changed, and report correct source of the problem
* code style cleanups and improvements

* security: restrict access to run-xpra script (chmod)
* security: cursor data sent to the client was too big (exposing server memory)
* fix thread leak - properly this time, SIGUSR1 now dumps all threads
* off-by-one keyboard mapping error could cause modifiers to be lost
* pure python/cython method for finding modifier mappings (faster and more reliable)
* retry socket read/write after temporary error EINTR
* avoid warnings when asked to refresh windows which are now hidden
* auto-refresh was using an incorrect window size
* logging formatting fixes (only shown with logging on)
* hide picture encoding menu when mmap in use (since it is then ignored)

* readonly command line option
* correctly stop all network related threads on disconnection
* faster pixel data transfers for large areas via mmap
* fix auto-refresh jpeg quality
* fix on-the-fly change of pixel encoding
* fix potential exhaustion of mmap area
* fix potential race in packet compression setup code
* keyboard: better modifiers detection, synchronization of capslock and numlock
* keyboard: support all modifiers correctly with and without keyboard-sync option

* bug fix: disconnection could leave the server (and X11 server) in a broken state due to threaded UI calls
* bug fix: don't remove window focus when just any connection is lost, only when the real client goes away
* bug fix: initial windows should get focus (partial fix)
* bug fix: correctly clear focus when a window goes away
* support key repeat latency workaround without needing raw keycodes (OS X and MS Windows)
* command line switch to enable client side key repeat: "--no-keyboard-sync" (for high latency/jitter links)
* session info dialog: shows realtime connection and server details
* menu entry in system tray to raise all managed windows
* key mappings: try harder to unpress all keys before setting the new keymap
* key mappings: try to reset modifier keys as well as regular keys
* key mappings: apply keymap using Cython code rather than execing xmodmap
* key mappings: fire change callbacks only once when all the work is done
* use dbus for tray notifications if available, preferred to pynotify
* show full version information in about dialog