View to email select users, groups or all users

Added new view with email icon to send email to omero users
Makes use of django's email capabilities until omero email features are
available
Email capabilities enabled only if email settings are set
Send webadmin email as html as well as plain text
Fixed display of no email settings

Fixed the admin tab highlight when the email disabled page is shown
Removed unused blocks form noemail template
Remove extra whitespace in email template
This feature is now hidden behind a development setting
Revert to using custom Experimenter and Group fields

ExperimenterModelMultipleChoiceField and GroupModelMultipleChoiceField
can not display the required information.
Renamed 'experimenters' to 'users' in form
Restricted email view to admins
Improved note on inactive users
Fixed inactive users always getting email addressed to all
Improved status/warning message on email sending

Correctly pluralize number of messages
Sending 0 emails is a warning, not success
Fixed failed_address display to remove python formatting
Final update to webadmin email inactive users message
Merge pull request #2127 from dpwrussell/admin_utils

Working view to email announcements to selected users, groups, email addresses and/or all users
Update develop submodules

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

Repository: openmicroscopy/bioformats
Updating 63fc1e0..3b856bc
Merged PRs (fast-forward):
  # PR 1191 melissalinkert 'FakeReader improvements, part 1'
  # PR 1205 melissalinkert 'TIFF: correctly account for ```fakeBigTiff``` when reading IFD entries'
  # PR 1209 melissalinkert 'ND2: fix tile reading when the X coordinate is > 0'
  # PR 1212 melissalinkert 'Fix Z and T size calculation for InCell 6000 data'
  # PR 1211 joshmoore 'Close IFormatReader copy if not to be used (rebased onto develop)'
  # PR 1208 rleigh-dundee 'docs: Merge xsd-fu prerequisites into build instructions (develop)'
  # PR 1199 melissalinkert 'Nikon .nd2 fixes, part 3 (rebased onto develop)'
  # PR 1193 melissalinkert 'Leica LIF: do not set Channel.Color for RGB images'
  # PR 1192 melissalinkert 'DICOM: fix units for physical sizes'
  # PR 1195 melissalinkert 'OME-TIFF: close helper readers when working with single-plane files (rebased onto develop)'
  # PR 1178 melissalinkert 'Nikon .nd2 fixes, part 2 (rebased onto develop)'
  # PR 1164 melissalinkert 'Add modulo support for LI-FLIM data'
  # PR 1187 melissalinkert 'ScanR: fix exposure time units'
  # PR 1194 melissalinkert 'CZI: prevent NumberFormatExceptions on missing/invalid position values (rebased onto develop)'

Repository: ome/scripts
Updating 9f8a7a0..9771f00
Merged PRs (fast-forward):
  # PR 88 mtbc 'Image from roi (rebased from dev_5_0)'

Repository: openmicroscopy/ome-documentation
Updating 191511b..ce96fa7
Merged PRs (fast-forward):
  # PR 858 hflynn 'Tidy Upgrade page incl. Paris requests for 5.0.3 (rebased onto develop)'
  # PR 861 hflynn 'Fix Dave Duhlman links in Model docs'
  # PR 857 sbesson 'Document orphaned datasets/plates retrieval via getProjects/getScreens (rebased onto develop)'
  # PR 854 mtbc 'Managed repository template path expansions (rebased from dev_5_0)'
  # PR 856 hflynn 'Removing developer standards page'
  # PR 824 sbesson 'OME DCO'
  # PR 834 aleksandra-tarkowska 'Session engine'
  # PR 849 hflynn 'Reformatting VA docs to make them less scary  (rebased onto develop)'
  # PR 846 hflynn 'Insert OMERO sidebar template after page TOC sidebar (rebased onto develop)'
  # PR 850 hflynn 'Re-working OMERO sysadmin index page (rebased onto develop)'
  # PR 843 aleksandra-tarkowska 'adding HTTP response header'
  # PR 845 manics 'Clarify fastcgi (rebased onto develop)'
  # PR 827 aleksandra-tarkowska 'Nginx doc'

Generated by OMERO-5.1-latest-submods#144 (http://ci.openmicroscopy.org/job/OMERO-5.1-latest-submods/144/)