Add Trusted-Only:true to the Insight manifest.

See http://docs.oracle.com/javase/6/docs/technotes/guides/jweb/mixed_code.html#trusted_only
Don't sign the webstart jars by default.

We're going to be code-signing in a separate process, so this prevents jars being double-signed, once with the self-signed cert and once with a proper one.

The webstart-sign target is still there, so you can use `./build.py webstart-sign release-webstart`.
Add an external webstart signing script

Automatically run this script with the existing self-signed certificate as part of the standard docs/hudson/OMERO.sh build
Merge pull request #2211 from knabar/fix-webgateway-missing-var

Fix missing variable (dev_5_0)
Ship log4j.jar with OMERO.matlab and add it conditionally to the Java path

This commit refactors the getOmeroJars() logic to rely on the Java class path
rather on hard-coded versions of MATLAB. The log4j and slf4j dependencies are
assessed independently.
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)
merge dev_5_0 -D org: PR 2173 (Minor adjustments for imagej-omero)
merge dev_5_0 -D org: PR 2176 (dev_5_0: Update upgrade check handling in OMERO.web)
merge dev_5_0 -D org: PR 2180 (fix #12011: move/delete datasets that share images)
merge dev_5_0 -D org: PR 2183 (Login as cli)
merge dev_5_0 -D org: PR 2185 (Mip 5150 (rebased onto dev_5_0))
merge dev_5_0 -D org: PR 2187 (Server restart)
merge dev_5_0 -D org: PR 2193 (More webstart code-signing changes)
merge dev_5_0 -D org: PR 2197 (OMERO.matlab slf4j dependencies)
merge dev_5_0 -D org: PR 2198 (Imagej omero)
merge dev_5_0 -D org: PR 2199 (Bugfix: Weird behaviour after switching users (rebased onto dev_5_0))
merge dev_5_0 -D org: PR 2203 (remove import logs as annotations on other entities)