TIFF: fix plane count calculation for pyramids with multiple planes

Fixes #12617.
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 1381 (Parse physical pixel sizes from CellSens .vsi datasets)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 1385 (C++: Add TIFF reader)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 1395 (C++: Various minor fixes)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 1404 (Re-enable URLHandleTest)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 1407 (TIFF: fix plane count calculation for pyramids with multiple planes)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only

Repository: openmicroscopy/bioformats
Excluded PRs:
  # PR 858 melissalinkert 'Initial support for Veeco AFM data' (label: exclude)
  # PR 1383 LeeKamentsky 'Fix im3 metadata' (user: LeeKamentsky)
  # PR 857 melissalinkert 'Initial support for Zeiss .lms files' (label: exclude)
  # PR 1177 rleigh-dundee 'specification: Add metadata for HDF5 embedding' (exclude comment)
  # PR 1015 qidane 'Messy binary' (exclude comment)
  # PR 1365 ctrueden 'PrairieView 5.2 fixes and improvements' (label: exclude)
  # PR 1396 qidane 'Units introduction for remaining quantities' (label: breaking)
  # PR 1362 melissalinkert 'Make FormatReader's RandomAccessInputStream transient' (label: breaking)
  # PR 1161 sommerc 'Initial CellH5 Reader class' (user: sommerc)
  # PR 1366 ctrueden 'Miscellaneous cleanup' (label: exclude)
  # PR 1309 melissalinkert 'Allow tile-based access of large JPEG-2000 images' (exclude comment)
Updating 2a99b8b..5eab8bd
Previously merged:
  # PR 1403 hflynn 'Removing dead visiquest link'

Merged PRs:
  # PR 1381 melissalinkert 'Parse physical pixel sizes from CellSens .vsi datasets'
  # PR 1385 rleigh-dundee 'C++: Add TIFF reader'
  # PR 1395 rleigh-dundee 'C++: Various minor fixes'
  # PR 1404 melissalinkert 'Re-enable URLHandleTest'
  # PR 1407 melissalinkert 'TIFF: fix plane count calculation for pyramids with multiple planes'

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