300 468 Annex A. Please test

TODO: This convertion should be done on strings received from SDT and 
EIT (and possibly others) in the TS demux as well.

Fix makefile

- Remove old kludges (get yourself a decently recent Mingw32 or die)

* Beginning of core implementation

  my algorithm is still not perfect: it should take account of the "thumb length"

  but I don't have a real video/audio file to test it...

instead of the painfully braindead one from wship6 that we'd rather
flatly ignore

Microsoft was probably too much afraid that developpers would request
version 0.2 instead of 2.0 so they switched straight from 1.1 to 2.2.

* If we are passed a SUB file as subtitle, just open the IDX instead, if there is one. (Closes: #681)

fixes for crash in Safari plugin when terminating (it actually locks the computer completely on some occasion)
- opengl.c: let End destroy elements created by Init, DestroyVout for CreateVout
- voutgl.m: set context to NULL on exit

  inputs are not yet added to the playlist

* Add a "playlist-tree" option to force onelevel/catgory mode