Re-hide and flatten DVExtHdrFields

Rather than expose the inner class, we flatten
its contents into the metadata table so that consumers
need not know of its existence.
Merge pull request #1110 from sbesson/rebased/develop/jenkins_docs_cleanup

BF docs: Jenkins cleanup (rebased onto develop)
merge develop -D org: PR 857 (Initial support for Zeiss .lms files)
merge develop -D org: PR 858 (Initial support for Veeco AFM data)
merge develop -D org: PR 981 (Ignore namespaces when filling in an XMLAnnotation's Value)
merge develop -D org: PR 983 (Woolz: make sure the service is initialized when calling openBytes (rebased onto develop))
merge develop -D org: PR 1108 (MRC: fix handling of mode 16 data (rebased onto develop))
merge develop -D org: PR 1138 (Lots of Zeiss CZI fixes (rebased onto develop))
merge develop -D org: PR 1145 (Make private class in DV reader public (see #12358))
merge develop -D org: PR 1154 (Leica: prevent exception when linking EmissionFilter)
merge develop -D org: PR 1155 (Memoizer errs (rebased onto develop))
merge develop -D org

Repository: openmicroscopy/bioformats
Excluded PRs:
  # PR 1156 sbesson 'Updating Zeiss links (rebased onto develop)' (status: error)
  # PR 1015 qidane 'Messy binary' (exclude comment)
  # PR 1116 rleigh-dundee 'cpp: Add TIFF support (1)' (label: exclude)
  # PR 1054 qidane 'Additional annotation points throughout the model' (exclude comment)
  # PR 1136 melissalinkert 'Add initial support for reading BinaryOnly OME-TIFF datasets (rebased onto develop)' (label: exclude)
  # PR 1158 hflynn 'Removing dead link from Minolta-MRW format page (rebased onto develop)' (status: error)
  # PR 1141 LeeKamentsky 'Reader for Amaris FlowSight .cif format' (status: pending)
  # PR 1123 melissalinkert 'Add a reader that accepts a file containing a file pattern' (label: exclude)
  # PR 816 melissalinkert 'Add support for multi-channel Volocity Clipping datasets' (label: exclude)
  # PR 978 berl 'Add writing of .v3draw format for easy loading with Vaa3D.' (user: berl)
Updating 25b73b1..bfa3027
Merged PRs (fast-forward):
  # PR 1110 sbesson 'BF docs: Jenkins cleanup (rebased onto develop)'

Merged PRs:
  # PR 857 melissalinkert 'Initial support for Zeiss .lms files'
  # PR 858 melissalinkert 'Initial support for Veeco AFM data'
  # PR 981 melissalinkert 'Ignore namespaces when filling in an XMLAnnotation's Value'
  # PR 983 melissalinkert 'Woolz: make sure the service is initialized when calling openBytes (rebased onto develop)'
  # PR 1108 melissalinkert 'MRC: fix handling of mode 16 data (rebased onto develop)'
  # PR 1138 melissalinkert 'Lots of Zeiss CZI fixes (rebased onto develop)'
  # PR 1145 joshmoore 'Make private class in DV reader public (see #12358)'
  # PR 1154 melissalinkert 'Leica: prevent exception when linking EmissionFilter'
  # PR 1155 joshmoore 'Memoizer errs (rebased onto develop)'

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