- repacketizing and reconstructing timestamps for a Dirac ES
   suitable for remultiplexing and decoding.
 - sanitizing an input stream that has non-signalled discontinuities
 - handling the basket case AVI fake-pts-is-dts method too:
   For a non well formed input (only has pts or dts), this is
   implemented by simulating the ReOrder Buffer model to resolve
   timestamps.

Updated 20090507 with:
 - use VLC_TS_INVALID rather than private block flags
 - removed useless i_sync_flags
 - add support for next_parse_offset == 0
 - eliminate dirac_FindEOS
 - use block_t's p_priv to avoid dirac_FindPictureNumber
 - remove b_picture_number, add parsecode helpers
 - when stream jumps backwards, generate correct EOS DU
 - dont use block_FindMaskedFlags
 - remove openloop fastsync
 - guarantee synchro sees EOS, remove duplicate EOS DUs
 - dont blindly believe that a data unit is > 1MB
 - fix compilation warning
 - fix issue with unsyncable p_extra
 - rearange file
 - add sanitization of prev_parse_offset
 - do duplicate EOS detection at the right place
 - move all operations on outqueue to Packetize
 - fix stupid offbyone on location of prev_parse_offset
 - sanity check output of sync at input to encapsualator
 - refactor dirac_BuildEncapsulationUnit
 - keep hold of precious timestamps
 - unfortunately block_t has no p_priv

Signed-off-by: David Flynn <davidf@rd.bbc.co.uk>
Signed-off-by: Laurent Aimar <fenrir@videolan.org>