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Merged "Allow application to replace filesystem functions used to open/read directories" from libbluray

License change for src/util/bits.h will require permission from someone in
VideoLAN team.

Also fix library build accordingly.

This ensures header files have the proper system header inclusions

          conv_tab, support seek and fixup methods.
          Make calls to dlopen be separate.
          Changed debug output to universal, added debug output to
          file support.

Accident: Universal build of libbluray.so/a, examples/. Minor changes to build
          on Unix.

char* nav_find_main_title(char *root);
	Find the playlist that corresponds to the main title.
	for now this is done by finding the longest title that
	contains no duplicate clips. "root" is the base of the 
	BD tree. The returned file name is the basename of the playlist.

NAV_TITLE* nav_title_open(char *root, char *playlist);
	Open a playlist for navigation.  "root" is the base
	of the BD tree. "playlist" is the basename of the playlist.

void nav_title_close(NAV_TITLE *title);
	Close a previously opened title.

NAV_CLIP* nav_next_clip(NAV_TITLE *title);
	Get information about the next clip in a title.  When called for
	the first time after opening a title, the first clip is returned.
	The clip information contains m2ts file basename, start packet number,
	end packet number, and connection condition.  Packet numbers are
	in 192 byte TS packet units.

examples/bdsplice.c has been modified to demonstrate nav_title_open, 
and nav_next_clip.

example/mpls_dump has been modified to demonstrate nav_find_main_title.

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file_linux -> file_posix
now we have fseeko/ftello instead of fseek/ftell

directory libbdnav contains the library 
directory examples has a few tools that use the library.

Parser API:
	MPLS_PL* mpls_parse(char *path, int verbose)
    	Parses a playlist file and returns result

	void mpls_free(MPLS_PL **pl)
    	Frees playlist data returned from mpls_parse.  Sets pointer to NULL.

	CLPI_CL* clpi_parse(char *path, int verbose)
    	Parses a clipinfo file and returns result

	void clpi_free(CLPI_CL **pl)
    	Frees clipinfo data returned from mpls_parse.  Sets pointer to NULL.

Examples:
	Examples all show available options with --help

	mpls_dump
		parses playlist files and displays contents.

	clpi_dump
		parses clipinfo files and displays contents

	bdsplice
		parses a playlist and all the clipinfo files associated with
		a particular title and splices the m2ts clips together into
		one file.

fixed free() in file abs (linux)

aacs work