reintroduce nearbyint, but use the 1001 multiplier.  adding 0.5 wasn't transforming 29.97 fps properly, and the earlier nearbyint was a hack for mpeg1/2.  the preceding mods were all partially right, partially wrong -- needed to combine the two change concepts. 

* modules/stream_out/transcode.c: reverted previous commit which didn't belong here and was also completely wrong.

* Patch to reenable sap-timeout functionality (Bug 2007) By Dermot McGahon, dermot at lincor dot com
  Modified by me.
* also restored some indentation of this file.

Thanks for the ftime-fix gibalou :)

* 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.