allow "ultrafast" x264 setting, but only when users select speed=100 via command line or UI:
* automatic speed only goes from 0 to 99 (not 100)
* when we set to 100, force an encoder re-init
* map speed=100 to "ultrafast" preset
* (also be more aggressive with presets - go faster)

git-svn-id: http://xpra.org/svn/Xpra/trunk@3531 3bb7dfac-3a0b-4e04-842a-767bc560f471
more correct check for encoder force_reload

git-svn-id: http://xpra.org/svn/Xpra/trunk@3532 3bb7dfac-3a0b-4e04-842a-767bc560f471
quality must be an int!

git-svn-id: http://xpra.org/svn/Xpra/trunk@3533 3bb7dfac-3a0b-4e04-842a-767bc560f471
allow webp lossy mode via UI:
* expose "encodings.with_lossless_mode" list of encodings
* show a new "lossless" option for quality in this case

git-svn-id: http://xpra.org/svn/Xpra/trunk@3534 3bb7dfac-3a0b-4e04-842a-767bc560f471
add some debug

git-svn-id: http://xpra.org/svn/Xpra/trunk@3535 3bb7dfac-3a0b-4e04-842a-767bc560f471
fix delta mode:
* copy reference pixels before they get modified
* re-enable by default, but limit size

git-svn-id: http://xpra.org/svn/Xpra/trunk@3536 3bb7dfac-3a0b-4e04-842a-767bc560f471
Add new x264 codec structure. Not working yet.
Remove x264lib.c.
remove enc_x264/decoder.pyx
setup.py: update CLEAN_FILES for new video backend infrastructure
dec_avcodec: fix .pyx tabs and calls to removed functions

nogil and xmemalign need to be cleaned
enc_x264: fix .pyx parameters
dec_avcodec: s/AVPixelFormat/PixelFormat/
csc_swscale: no semicolons in .pyx files
csc_swscale: lose "struct" qualifier, fix tabs vs. spaces
csc_swscale: more work
dec_avcodec: "in" is reserved in python.
dec_avcodec tabs vs spaces - again
dec_avcodec: import codec constants
dec_avcodec: upd