-get rid of bad merge remnant

contribs: don't try to install the shared library if it doesn't exist, fix [22437]. Spotted by John Dalgliesh

checks if playlist has been stopped in the input "state" callback
holds the p_sys mutex only when writing/reading audioscrobbler_song_t data

allocate as much as we can on the stack, to avoid numerous malloc() & free()
fix memory leaks by the same way
metadata reading is now performed exclusively from the callbacks
don't use linked lists anymore, but a queue of a fixed size of 50 songs, i.e. the maximum we can transmit in one submission.
properly unloads the module when encountering a fatal error, like no username/pw, no memory, VLC being banned by last.fm servers ...

homepage: use %? to represent '?'
other: probe is not successfull anymore for urls like http://10.0.0.1/get_video?xxxx&origin=youtube.com

      Cosmetics
      Set svn:keywords

Someone should really review this.
This does not affect the trivial resampler; I have not checked the others.

This screws up any audio codec that does not support transrating.
There is something fishy here.

(rather than as big packets as possible)