Fix sessions.py header
Add CLI/API for passing sudo parameter
sessions.py: Add call to createSessionWithTimeouts
Fix empty string bugs in SessionManagerImpl

Probably since the move to Ice, null strings in the
Principal object have been converted to empty strings
which have failed the various tests for setting defaults.
Fix #11989: set PYTHONPATH once on Windows.
Ressurect setpythonpath.bat.
Record 'omero.sudo' in session file
Fix unit test test_sess.py
Merge pull request #2179 from mtbc/trac-12051-close-img-tag

fix #12051: close img tag
Add Z-projection range to Blitz Gateway. See #5150
Add Z-projection range to webgateway. See #5150
Handle Blitz img.setProjectionRange(None, None)
Add admin kill command
Fix flake8 warning
Add System.exit to Java table examples
Improve stdout/stderr on 'cant find params'
merge dev_5_0 -D org: PR 2108 (release-src includes bioformats version metadata)
merge dev_5_0 -D org: PR 2158 (assist #11091: refactor server DB queries for hierarchy navigation (rebased))
merge dev_5_0 -D org: PR 2167 (Passes channel configuration to Make_Movie (see #12036))
merge dev_5_0 -D org: PR 2168 (Update dev_5_0 submodules)