create a simple cache for storing model hierarchy lookups
create simple methods in a base class for model hierarchy navigation
create a wrapper for hierarchy navigation using different types
adjust PojosImpl to use hierarchy navigator

this will make changes for ticket 11019 easy to implement
change preprocessor to use hierarchy navigator
adjust do-all for change in preprocessor constructor
update preprocessor test class with latest changes
remove weird rebase artifact
replace local function with third-party library function
Silence org.bushe for imagej
Set OMERO_HOME in processor.py
Passes channel configuration to Make_Movie (see #12036)

Depends on https://github.com/ome/scripts/pull/67 (see #12037)
Bugfix: User now must set another group than 'user'
Removed unncessary if construct
Set default socket timeout correctly (Fixes #12097)

Python socket timeouts are specified in seconds as floating point.  This
commit sets the default timeout to a more reasonable 3 seconds, allows
the specification of a floating point timeout value, removes the
assumption that the timeout is specified in milliseconds and documents
all of the aforementioned.
Support for configuring the upgrade check URL (See #12097)

This commit adds configurability to the upgrade check URL via the
OMERO.web configuration mechanism.  Upgrade checks in OMERO.web can now
be disabled by running:

    bin/omero config set omero.web.upgrades_url ''
Use existing "omero.upgrades.url" configuration option
fix 12051: close img tag
Merge pull request #2172 from dominikl/rebased/dev_5_0/user_in_no_group

Bugfix: User now must set another group than 'user' (Ticket #11926) (rebased onto dev_5_0)
Fix sessions.py header