Merge pull request #1374 from rleigh-dundee/cpp-fixes

C++: Collected small fixes
Re-organize developers documentation index
Split using-bioformats file
Rename contributing sections
Limit maxdepth of main index page
Replace BigTiff sample link
DICOM: also use the pixel sign tag to detect the pixel type

Closes #12568.
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 1376 (Developer doc restructuring)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 1377 (Replace BigTiff sample link)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 1378 (DICOM: also use the pixel sign tag to detect the pixel type)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only

Repository: openmicroscopy/bioformats
Excluded PRs:
  # PR 1366 ctrueden 'Miscellaneous cleanup' (label: exclude)
  # PR 858 melissalinkert 'Initial support for Veeco AFM data' (label: exclude)
  # PR 1177 rleigh-dundee 'specification: Add metadata for HDF5 embedding' (exclude comment)
  # PR 1309 melissalinkert 'Allow tile-based access of large JPEG-2000 images' (exclude comment)
  # PR 1265 qidane 'New units' (label: breaking)
  # PR 1362 melissalinkert 'Make FormatReader's RandomAccessInputStream transient' (label: breaking)
  # PR 1375 rleigh-dundee 'C++: Documentation updates' (status: pending)
  # PR 1015 qidane 'Messy binary' (exclude comment)
  # PR 1161 sommerc 'Initial CellH5 Reader class' (user: sommerc)
  # PR 857 melissalinkert 'Initial support for Zeiss .lms files' (label: exclude)
  # PR 1365 ctrueden 'PrairieView 5.2 fixes and improvements' (label: exclude)
Updating 4fee2f2..3d66506
Previously merged:
  # PR 1374 rleigh-dundee 'C++: Collected small fixes'

Merged PRs:
  # PR 1376 sbesson 'Developer doc restructuring'
  # PR 1377 hflynn 'Replace BigTiff sample link'
  # PR 1378 melissalinkert 'DICOM: also use the pixel sign tag to detect the pixel type'

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