ncurses: ressuscite file browser, and 'A' key (add an entry) with support for media library\nchecks vasprintf() return value

playlist/services_discovery.c: Isolate more the services_discovery code from the playlist code by having two separate header. Partly revert [22536].

playlist/services_discovery.c: Attempt at removing also node as well as regular items. Need some testing with the hal services_discovery module.

services_discovery: storing the category & onelevel playlist items with the services_discovery_t is not needed anymore, simplify that.
put the services_discovery_t** in the public playlist_t to save one unchecked malloc() and the corresponding free()

macosx: playlistinfo.m. small typo which caused ObjC exception and froze interface updates and screensaver management, etc...

Qt4 - use a docked playlist, remove dead code, don't reinvent the wheel, remove the behaviour where media library hides the video. Don't split the menu between two dialogs, this is weird and anti sane GUI guidelines.
Use enums when you can.
Add the popup menu to the always video cone.
And more...

services_discovery: stores the category & onelevel playlist_item_t* in the services_discovery_t structure
simplify upnp* and hal modules

(Still MIDI tempo is critically missing)

width and height are specified in the subtitles stream. This may
result in chunkier text in some instances, but it should get it
back on screen at least. Will look into smoothing it out next.