Add COC/QCC in main header when needed

[mayeut]

Update #459

[malaterre]

Can we get a little bit more info about this ? Maybe a small unit test that exhibit the issue ? Or is this solved as mentionned in #459 with PR #8 ?

[mayeut]

@malaterre, there's already test cases in the test suite for this as mentioned in #459 & data with uclouvain/openjpeg-data#8:
NR-ENC-issue203-32x32-bgr16.bmp-43-compare_dump2base
NR-ENC-issue203-32x32-bgr16.bmp-43-compare_dec-ref-out2base
NR-ENC-issue203-33x33-bgr16.bmp-44-compare_dump2base
NR-ENC-issue203-33x33-bgr16.bmp-44-compare_dec-ref-out2base
NR-ENC-issue203-127x64-bgr16.bmp-49-compare_dump2base
NR-ENC-issue203-127x64-bgr16.bmp-49-compare_dec-ref-out2base

The tests are now ok with this PR

basically what it does:
When when setting up main header writing in opj_j2k_setup_header_writing, add new procedures that will write COC/QCC. Those procedures will only write something if COC/QCC is different from COD/QCD so that there's no regression with previous implementation for normal cases.