* modules/codec/dvbsub.c: first implementation of dvb text subtitles encoding/decoding (a few things are still to be done).

Not tested...

ps.c -- add i_rate_bound (MPEG spec 13818 requires rate_bound >= that of any packet in the stream) (I'm not positive, but program_mux_rate, based on instant_rate, should also possibly change.  Per 2.5.3.4 of the spec,it sounds like it might be the forward-looking rate; reporting a last-second value based on P frames,if the forward packets have an I frame, might not be correct [specs are a pain])

* modules/audio_filter/resampler/linear.c: ported linear resampler to audio filter 2 architecture. Patch courtesy of Matthew Hodgson (matthew at mxtelecom dot com) + cleanup and fixes by me.

* modules/stream_out/transcode.c: simplifications + more extensive audio filter searches for conversions.

 modules/codec/araw.c: a/ulaw encoding support. Patch courtesy of Matthew Hodgson (matthew at mxtelecom dot com) + cleanup by me.

* modules/audio_filter/*: set the output format to what's really being output.

* src/misc/image.c, src/video_output/vout_intf.c: handle aspect ratio changes in image_Convert() as well.
* modules/video_output/picture.c: set all the fields of fmt_in for image_Convert().

* modules/codec/ffmpeg/video_filter.c: resampling fix for when source or dest is not in I420 format.

Quick patch to make pda.c inteface compile again. It disables the management of the slider on the GUI.

plugin.cpp: some minor cleanup