* Fix avformat demux IOSeek. Should improve playback of some flv's 
 * Improve avformat demux SET_POSITION. 

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M    src/libvlc.h
M    src/stream_output/sap.c

control media seek 10   -> seek to position 10% (previous behavior)
control media seek +10  -> seek 10% forward
control media seed -10  -> seek 10% backwards
control media seek 10s  -> seek to position 10s (works with +- too)
control media seek 10ms -> seel to position 10ms (works with +- too)

Add msecseek command in VLM to seek to a position given in milliseconds. Patch by Igor Helman ( http://forum.videolan.org/viewtopic.php?t=27989 )
+ misc variables handling changes by me

Return syntax error message when issuing invalid instance specific control command in VLM. ("control test thisisaninstanceid play" is valid, "control test thisisaninstanceid asdqsd" isn't).

A bit of cleanup in simple prefs

instead of aborting

* wxwidgets: revert go-where-you-click slider changes from [15391] and [15393] as it wasn't optimal (more accurate at the middle and not so much towards the beginning or end) and this also prevented proper slider select and drag usage.

  to avoid crashes in the messaging system (global data has no libvlc pointer)
- Rename ROOT to GLOBAL to avoid confusion (the root is LIBVLC, not GLOBAL)