POTFILES.in: Refresh it

vout: attach picture heap to temporary picture, so that modules (such as blend) have access to the extra info in heap

* Some files have been renamed -> update POTFILES.in

string was being added to the playlist, which resulted in an error. Patch  by Nick Vercammen.

* playlist.c, asx.c: add new --playlist-skip-ads option (default enabled) to skip autodetected ads. Test playlist: "http://www.zoomin.tv/asx/dsp_asxplaylist.cfm?id=251350&pid=lefigaro&quality=2&WMCache=0&iebr=0". Assumption is: if the playlist states that an item shouldn't be skipped or can't be seeked in, then it's an ad.

* include/vlc_url.h: vlc_UrlParse(): forbid use of '/' in login or password. Fixes use of URLs like "http://www.lemonde.fr/web/video/0,47-0@2-3210,54-913109@51-891944,0.html".

(It has to be improved to get the time from the tdt/tot and not from time())

Not yet implemented: libvlc_vlm_show_media and libvlc_vlm_get_media_title/chapter/seekable.
Is libvlc_vlm_show_media usefull ?