Xpra

* fix popup windows focus issue
* fix "xpra upgrade" subcommand
* fix server backtrace in error handler
* restore server target information in tray tooltip
* fix bencoder error with no-windows switch (missing encoding)
* add support for RGBX pixel format required by some clients
* avoid ffmpeg "data is not aligned" warning on client
* ensure x264 encoding is supported on MS Windows shadow servers

* fix focus regression
* fix MS Windows clipboard copy including null byte
* fix h264 decoding with old versions of avcodec
* fix potential invalid read past the end of the buffer
* fix static vpx build arguments
* fix RGB modes exposed for transparent windows
* fix crash on clipboard loops: detect and disable clipboard
* support for ffmpeg version 2.x
* support for video encoding of windows bigger than 4k
* support video encoders that re-start the stream
* fix crash in decoding error path
* forward compatibility with namespace changes
* forward compatibility with the new generic encoding names

* fix h264 decoding of padded images
* fix plain RGB encoding with very old clients
* fix "xpra info" error when old clients are connected
* remove warning when "help" is specified as encoding

* fix misapplied patch breaking all windows with transparency

* fix client crash on Linux with AMD cards and fglrx driver
* fix MS Windows tray forwarding (was broken by fix from 0.10.6)
* fix missing WM_CLASS on X11 clients
* fix Mac OSX shadow server
* fix "xpra info" on shadow servers
* add usable 1366x768 dummy resolution

* fix window titles reverting to "unknown host"
* fix tray forwarding bug causing client disconnections
* replace previous rencode fix with warning