Added method to find all Datasets linked to a certain image
Added Multiple-Dataset warning dialog #11883

When the user wants to delete an image which is linked to multiple datasets a warning dialog will be shown, see trac #11883
Change superclass of ParserOpenFileMessage
Set BasicEventContext logging to WARN
Merge pull request #2154 from sbesson/rebased/develop/12010_cli_usage

Unify command-line importer help (rebased onto develop)
Renamed Copy/Cut/Paste, improved tooltip, see trac #11881
Renamed 'Unlink' tag options into 'Remove', see trac #11884
Updated copyrights to include 2014
Changed name/description for user management tab
Adapted description texts in Treeviewer tab toolbars
Implemented Blazej's suggestions

Updated copyright;
Formated code to match CodeTemplate.java;
Synchronized popup menu and tab bar tooltips;
Added empty method to NullOmeroPojoService to match OmeroDataService interface
Added comment, updated copyright date
fixing embedding dragdiv.mousewheel in viewer
introducing js and css compression using django-pipeline, see #11519

This is first step to make embedding the viewer simple
example of static HTML code in webtest/embedded.html
adding django-pipeline minify to the main build, close #11519

it still requires compressor installation. default is yuicompressor
fixing omeroweb build.xml
removing unused pipeline config from settings.py
upgrading django-pipeline to 1.3.20
fixing image paths in css files and cleaning up jquery-ui