ND2: ignore all blocks of image offsets except for the last one

Extra, possibly invalid, planes are sometimes stored before the first
true image in the dataset.  We now do what NIS Elements does, and ignore
everything except for the last continuous block of image offsets.

See
http://lists.openmicroscopy.org.uk/pipermail/ome-users/2014-July/004589.html
ND2: adjust default buffer size to speed up initialization

See http://trello.com/c/1ZClsqPU/42-nd2-performance
merge develop -D org: PR 983 (Woolz: make sure the service is initialized when calling openBytes (rebased onto develop))
merge develop -D org: PR 1154 (Leica: prevent exception when linking EmissionFilter)
merge develop -D org: PR 1229 (Final .nd2 fixes for 5.0.3 (rebased onto develop))
merge develop -D org

Repository: openmicroscopy/bioformats
Excluded PRs:
  # PR 1177 rleigh-dundee 'specification: Add metadata for HDF5 embedding' (exclude comment)
  # PR 1204 rleigh-dundee 'cpp: Add PixelBuffer<> and VariantPixelBuffer' (exclude comment)
  # PR 1015 qidane 'Messy binary' (exclude comment)
  # PR 978 berl 'Add writing of .v3draw format for easy loading with Vaa3D.' (user: berl)
  # PR 816 melissalinkert 'Add support for multi-channel Volocity Clipping datasets' (label: exclude)
  # PR 1141 LeeKamentsky 'Reader for Amaris FlowSight .cif format' (label: exclude)
  # PR 1225 sbesson 'Fix bfGetReader for empty input (rebased onto develop)' (status: error)
  # PR 857 melissalinkert 'Initial support for Zeiss .lms files' (label: exclude)
  # PR 1136 melissalinkert 'Add initial support for reading BinaryOnly OME-TIFF datasets (rebased onto develop)' (label: exclude)
  # PR 1054 qidane 'Additional annotation points throughout the model' (exclude comment)
  # PR 858 melissalinkert 'Initial support for Veeco AFM data' (label: exclude)
  # PR 1161 sommerc 'Initial CellH5 Reader class' (user: sommerc)
Already up-to-date.

Merged PRs:
  # PR 983 melissalinkert 'Woolz: make sure the service is initialized when calling openBytes (rebased onto develop)'
  # PR 1154 melissalinkert 'Leica: prevent exception when linking EmissionFilter'
  # PR 1229 melissalinkert 'Final .nd2 fixes for 5.0.3 (rebased onto develop)'

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