* livedotcom: added a --rtsp-kasenna option to tell liveMedia to speak Kasenna RTSP dialect for a certain rtsp:// link.

* configure.ac: autodetect ffmpeg build options when using --with-ffmpeg-tree + make sure we use the libs in the given tree.

  - for muxers that request some preparsing before starting muxing,
    we now wait for 1.5 seconds worth of data to be in the fifo instead
    of waiting for 1.5 seconds of real-time.
  - if we have have control over the output pace, we also wait before
    starting muxing (produces nicer streams).

    + Fixed erroneous extra "/" in URLs sent to a proxy.

* src/video_output/video_output.c: fixed video filter on-the-fly switching (use var_Get/Set instead of config_Get/Put).

* modules/codec/dvbsub.c: another bunch of sanity checks to make the decoder more resiliant to bad streams.

  - rewrite using the pixel buffer memory model as described in ETSI EN 300 743.
  - code simplification.
  - more compliant.

* modules/gui/wxwindows/video.cpp: will hopefully fix the gray video problem in embedded mode on win32.

* src/video_output/video_output.c: even uglier fix for the on-the-fly deinterlacing switch problem (but at least it works).

* modules/codec/ffmpeg/ffmpeg.c: use SSE2 detection.

  * po/fr.po: converted to UTF-8 and fixed ellipses.
  * po/en_GB.po: converted to UTF-8 and fixed ellipses.