Fix compilation

  - fix last bugs with SPDIF stream selection
  - code and debug cleanup
  - added more comments to clearify the code, so it is useful to others :D

* Set FD_RDAHEAD and FD_NOCACHE on when reading from files. improves reading from networkshares and VMEM usage.
  Suggested by Marko Karppinen.

dvdnav.patch: changed code that read DVD title to use dvdread APIs, so that WIN32 and non-unix platforms can also read it
dvdnav.c: add DVD title to meta information

  this and [13857] [13858] refs #182

Initial support for registering and handling some shared stats 

* realigning of some of the configure --help options
* added --with-macosx-sdk
  - compiles VLC (not contrib) with the 10.3.9 SDK
  - uses a small hack to enforce the deployment target when you do make in the srcdir
  - requires you to use gcc 4.0 on on Mac OS X 10.4

    + Implemented support for --image-out-format.
    + Added support for JPEG output. Still defaults to PNG.

    output level when --no-skip-frames was specified.