compiler warnings (such as buffer overflows detected at compile time!)

Please fix it *** IF YOU KNOW WHAT YOU ARE DOING ***

Uses --no-media-library if you don't want to use it (see #1047)

Remembers art url when an input with same artist & album needs art, so if it's a local file, it doesn't need to be copied in the cache.

extra/MacOSX/VLC_app: Initial import of a wanna-be VLC.app application that use the framework. Not really valuable for now.

configure.ac: removed -Wold-style-definition from CFLAGS as this affects AC_TRY_COMPILE() and causes false results such as:

checking __attribute__ ((aligned ())) support... 0
checking __attribute__ ((format ())) support with function pointers... no

control/media_list.c: Replace set_name/name by set_media_descriptor/media_descriptor. This is the md from which the media_list is a subitem, if any.