Patch to read GML geo metadata and other associated data for inclusio…#1110

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HWiman wants to merge 11 commits intouclouvain:masterfrom

HWiman:associated_data_support

Commits on Mar 23, 2018

Reinserted comment that was "lost in translation"
HWiman
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Commits on Mar 28, 2018

Run astyle
rouault
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Commits on Apr 11, 2018

Merge pull request #1 from rouault/associated_data_support
HWiman
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Commits on May 28, 2018

- Moved ASOC data to opj_jp2_metadata_t
HWiman
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Merge branch 'associated_data_support' of https://github.com/HWiman/openjpeg into associated_data_support
HWiman
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- Always return metadata struct, but set asoc to null iff j2k.
HWiman
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