several patches to taglib 1.7 (based on the tag)

[Tal Sliwowicz]

I've created several patches based on taglib 1.7. They can easily be merged
to the the master as well.

1. Fixed memory leaks.
2. Added m4v and aac files to the list of files supported after testing it
works
3. Added a debug callback function. I use this to print messages to the log
file instead of cout

Hope these help and make it to the general release.

Tal
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