Ignore namespaces when filling in an XMLAnnotation's Value

This prevents the xmlns on Value from being set to an empty string.
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 881 (New wavelength)
merge develop -D org: PR 970 (C++: Add FormatReader implementation)
merge develop -D org: PR 973 (C++: Fixes for the OME-XML model and metadata store interfaces)
merge develop -D org: PR 975 (cpp: cmake: Don't enable -pedantic if it breaks long long use)
merge develop -D org: PR 981 (Ignore namespaces when filling in an XMLAnnotation's Value)
merge develop -D org

Repository: openmicroscopy/bioformats
Excluded PRs:
  # 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 528 melissalinkert 'Tile performance improvements for VMS and NDPI' (label: exclude)
Updating 5347672..7e63798
Merged PRs (fast-forward):
  # PR 859 melissalinkert 'Assorted metadata/tile parsing fixes'

Merged PRs:
  # PR 857 melissalinkert 'Initial support for Zeiss .lms files'
  # PR 858 melissalinkert 'Initial support for Veeco AFM data'
  # PR 881 qidane 'New wavelength'
  # PR 970 rleigh-dundee 'C++: Add FormatReader implementation'
  # PR 973 rleigh-dundee 'C++: Fixes for the OME-XML model and metadata store interfaces'
  # PR 975 rleigh-dundee 'cpp: cmake: Don't enable -pedantic if it breaks long long use'
  # PR 981 melissalinkert 'Ignore namespaces when filling in an XMLAnnotation's Value'

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