Add colorspace context dummy functions to cmapdump.c
Update OpenJPEG to v2.0.0.
Update openjpeg with latest commits.
Bug 693503: Fix infinite loop within JPEG2K stream reading.

The openjpeg stream reading code is supposed to return -1 to
mean 'EOF'. Update our implementation in line with this.

This stops samples_mupdf_001/402.pdf.SIGSEGV.2e4.2672 going into
an infinite loop.
Bug 693540: Update OpenJPEG2 with fix for expected number of parts.
Merge branch 'OpenJPEG2' of git://git.ghostscript.com/user/robin/mupdf into OpenJPEG2
Merge branch 'OpenJPEG2' of https://github.com/zeniko/mupdf into OpenJPEG2