* luaplaylist.c: add vlc.msg_{info,err,warn,dbg}() functions. register the vlc.read() and vlc.readline() for parse() only (so that they can't be used in the probing phase)
* share/luaplaylist/*: move help to README.txt

* ps.c: Change demux2 capability from 9 to 8
* ty.c: Change demux2 capability from 8 to 6
* playlist/{Modules.am,playlist.c,videoportals.c}: remove video portals C version

* luaplaylist.c: add support for meta data info. Playlist items now use .path and .name (instead of .url and .title as those are used for meta data).
* luaplaylist/dailymotion.lua: add support for "description" and "arturl" meta data items.
* luaplaylist/*lua: update source to make it work with new playlist conventions.
* luaplaylist/youtube.lua: update help instructions.

* luaplaylist.c: should now look in the appropriate directory if VLC is installed. + add vlc.read() function.

It breaks linking, and it is redumdant with libtool export-symbols

Not cleared for use by IT managers, quality and/or test engineers because of serious hazard of heart attack.

 - Revert [20138]
 - Revert [20139]

Special credits to these commits for:
 - breaking the build system,
 - crashing VLC on every single 64-bits platform,
 - breaking bootstrap with any version of automake that is not the same as the one on Jean-Paul's computer.