v501: some fixed bugs (not complete) ...and new ones

[bluedan]

If not elsewhere written:

fixed
- in chapter viewer permutation navigation is now possible (1st chap-> last and vice versa)
- audio stream cycle is working again (ogm)

bugs
-mkv support with ogg audio is still worth a crash
-subtitle stream cycle is broken (ogm)
-2cd movie: a. player still falls back to first audio/sub streams on cd switch
b. on switch movie continues in windowed mode

Maybe this is useless, since BST is planning to release v1.0.
I expect him to have solved this..

Anyway, I'm glad he's still going on.