webadmin navigation moved to admin base template

Instead of each webadmin template redefining the webadmin links do it in
the base template. Javascript uses the url to highlight the current
navigation tab for the webadmin page
Prevents a NPE being thrown
Just added comment
Prevent deletion of users and group
Updated copyright date
remove obsolete dropbox directory check
Fixed admin tab selection

Admin tab selection was relying on a specific url deployment with a set
number of path components. Now it simply looks at the last component
which is reliable
Fixed spacing
Merge pull request #2367 from dpwrussell/webadmin_nav

Move webadmin navigation to base template
Merge pull request #2459 from mtbc/remove-dropbox-dir-check

remove obsolete dropbox directory check
Merge pull request #2426 from dominikl/delete_user_bug

Bugfix: Prevent user/group deletion
Update develop submodules

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

Repository: openmicroscopy/bioformats
Updating f247b30..9d07147
Merged PRs (fast-forward):
  # PR 1075 hflynn 'Remove dead bitmap link (rebased onto develop)'
  # PR 1076 hflynn 'Adding CONTRIBUTING file to BF repo (rebased onto develop)'
  # PR 1073 rleigh-dundee 'docs: Delegate all sphinx Makefile targets to ant'

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

Repository: openmicroscopy/ome-documentation
Updating be161c6..309d0cf
Merged PRs (fast-forward):
  # PR 771 hflynn 'Adding pyramid generation data duplication warning to in-place import (rebased onto develop)'
  # PR 760 rleigh-dundee 'Make Ice 3.4 the minimum supported version'
  # PR 768 hflynn 'Rephrasing CONTRIBUTING re: branch for PRs (rebased onto develop)'
  # PR 769 hflynn 'Making API doc links point at release version (rebased onto develop)'
  # PR 766 rleigh-dundee 'ant: Default all properties and handle empty vars in conf.py'
  # PR 758 hflynn 'Adding API doc links to OMERO docs front page (rebased onto develop)'
  # PR 759 hflynn 'ticket 10030 fix - contributing file for docs repo (rebased onto develop)'
  # PR 761 rleigh-dundee 'Delegate all Makefile targets to ant'

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