Remove unused 'unwrap' import
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
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
adjust for permitting no root-owned directories
Fix Python 2.7 syntax -> 2.6
Re-add support for --debug=ALL
merge dev_5_0 -D org: PR 2187 (Server restart)
merge dev_5_0 -D org: PR 2242 (Use mklink under Windows)
merge dev_5_0 -D org: PR 2309 (Add debugging of NPE in InteractiveProcessorI)
merge dev_5_0 -D org: PR 2365 (Shared rendering settings)
merge dev_5_0 -D org: PR 2410 (Update dev_5_0 submodules)
merge dev_5_0 -D org: PR 2448 (fix #12160: root-owned template paths)
merge dev_5_0 -D org: PR 2464 (Support for using other keys for "show" functionality)
merge dev_5_0 -D org: PR 2469 (Large selection)
merge dev_5_0 -D org: PR 2479 (Parsing of `--debug` on import)
merge dev_5_0 -D org: PR 2480 (Get objects get images)
merge dev_5_0 -D org: PR 2482 (Update MATLAB examples for 5.0.x)
merge dev_5_0 -D org: PR 2483 (OMERO.web tree speedup)
merge dev_5_0 -D org: PR 2487 (Maven/ant improvements (rebased onto dev_5_0))
merge dev_5_0 -D org: PR 2491 (Add capability to work with file handle)