Fix: No ActionListeners attached to help menu items
library.py: Add helper methods.
library.py: Optimise imports.
test_delete.py: Use new helpers.
test_{delete,chgrp}.py: Add tests.

This commit implements tests from tickets #12452 and #12544.
test_chgrp.py: Optimise imports.
Add docstrings and verify parameter types.
Verify and update comments.
Update delete test assertions and comment.
Merge pull request #3163 from bpindelski/12452-tests

Add chgrp/delete Python tests (assist #12452 and #12544).
Merge pull request #3173 from dominikl/help_menu_fix

Bugfix: Help menu not working
Update develop submodules

Repository: openmicroscopy/openmicroscopy
Already up-to-date.

Repository: openmicroscopy/bioformats
Updating e9cb435..664309e
Previously merged:
  # PR 1415 melissalinkert 'Update Travis to build the 'utils' Ant target'
  # PR 1395 rleigh-dundee 'C++: Various minor fixes'
  # PR 1413 rleigh-dundee 'C++: Correct version embedding'
  # PR 1416 melissalinkert 'Update version history for 5.0.6 (rebased onto develop)'
  # PR 1404 melissalinkert 'Re-enable URLHandleTest'
  # PR 1411 melissalinkert 'Metamorph: fix double value parsing for locales that use a comma separator'
  # PR 1412 melissalinkert 'Zeiss CZI: prepend 0s so that image names are all the same length'
  # PR 1410 mtbc 'add RandomAccessOutputStream(byte[]) constructor'
  # PR 1409 hflynn 'Removing jpeg 2000 broken link (rebased onto develop)'
  # PR 1403 hflynn 'Removing dead visiquest link'
  # PR 1387 sbesson 'Fix testng JAR for Bio-Formats tools components'
  # PR 1384 melissalinkert 'OME-TIFF: return blank planes if the corresponding file does not exist'
  # PR 1386 melissalinkert 'Zeiss CZI: fix dimension calculations when expected planes are missing'
  # PR 1397 hflynn 'replacing boostpro link'

Repository: ome/scripts
Already up-to-date.

Repository: openmicroscopy/ome-documentation
Updating d7681c9..436c249
Previously merged:
  # PR 1027 hflynn 'Adding note about openjdk8 not being supported (rebased onto develop)'
  # PR 1014 bpindelski 'Ldap.txt: cleanup and update column names.'
  # PR 1022 hflynn 'In-place import user & group set-up plus minor tidy'
  # PR 1021 sbesson 'Review documentation for release infrastructure'
  # PR 1024 hflynn 'Variable names in example are swapped (rebased onto develop)'

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