- 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.

 * doc/skins/skins2-howto.xml: Updated doc

- fix load/save of configuration and creation of configuration directory (refs #528)

Re-enabled i420_yuy2_mmx on Darwin/x86.

   You can use the following actions in the XML file:
    - dvd.nextTitle()
    - dvd.previousTitle()
    - dvd.nextChapter()
    - dvd.previousChapter()
    - dvd.rootMenu()

  (one must use stat() rather than lstat() to obtain the size of a file's content!)
- Use UTF-8 wrappers (refs #528)

- FromLocaleDup() returns a string to be freed with free() instead of LocaleFree()

 nor pkg-config

Fix a bug in exceptions handling

- Make (To|From)Locale a no-op on OSes always using UTF-8

* Do a proper UTF-16 -> UTF-8 conversion on ASF metadata, instead of ignoring one of it's bytes per char.
  Patch by demo-n <http://demo-n.e-neta.jp>. (Can i have your name for the THANKS file please?)
  

it now ignores
 - commments <!-- ... -->
 - processing instructions <? ... ?>
 - doctype declarations <!DOCTYPE ... >
and can handle
 - CDATA element content <![CDATA[ ... ]]>

wx/dialogs/*: Don't put labels in buttons if we have a wxID_FOO. So the buttons are themable on GTK.