growl.c: add --growl-ttl option

It is built by default since it sends notifications to network (perhaps
we should only build it on macos).

msn.c: should fix a refcount issue (*not tested*)

* Some test work
* Export vlm_MediaSearch

Thanks to Hobophobe on http://forum.videolan.org/viewtopic.php?t=17262

- Fix memory leak

valid (UTF-8) or not (incomplete, incorrect non-ASCII, or overlong sequences)

If someone has a better code to maintain a black screen, change
CGSetDisplayTransferByFormula which seems to be a big kludge.

- Handle backspace properly on an UTF-8 characters string (closes #548 as far as UTF-8 is concerned)

- Use VidMode extension to determine the display dimensions more accurately when enabling full screen mode (fixes #534, should fix Debian #290392)
- Move view port and cursor to a sane position
- Check for VidMode extensions (libXxf86vm)

    because some Xv drivers do not necessarily pad video at 16 bytes.

- Unicode file names fixes

- getcwd() unicode fix

skins2 and galaktos remain as I'm not sure how they (don't?) handle
encodings.

http interface URL were purposedly not made to use Unicode. I'm open to
suggestions on that one.