Add web proxy configuration support for linux clients network probes

Detect network availability in NetworkChecker using HTTP URL
instead of plain socket connection : this allows clients connecting
to the internet through a web proxy to configure HTTP proxy settings
for the JVM in startup shell scripts.

Adresses problem reported in OMERO user discussion forum at
http://www.openmicroscopy.org/community/viewtopic.php?f=4&t=4509
Remove logging in NetworkChecker and harmonize Insight's install doc

As per review feedback - PR 1070
Update submodules
Merge pull request #1108 from snoopycrimecop/merge/develop/submodules

Update develop submodules
Merge pull request #1058 from joshmoore/fs-file-caching

Fs file caching (#10535)
Log some import logs to import logfile in ManagedRepository.

This gets the log file into the right place but still needs some work
cleaning up after itself and the logging needs improving.
Using RepositoryDao bean
Initial commit for annotating Fileset with log.
Make a non-current RepoDao.register() method
Create CheckedPath from ImportLocation.target

Conflicts:

	components/blitz/src/ome/services/blitz/repo/ManagedImportRequestI.java
Remove extra argument from RepositoryDao.register
Change attachLog to work inside a transaction.
Add ManagedImportLocationI.logFile
Use log file location from ImportLocation
Change wrapper back to reader.
Update file size later in logging.
Add back in merged out import statements.
Fixing use of OMEROWrapper constructor.
Remove almost all debug meta-logging from ManagedImportRequestI
Publish PreferenceContext properties to System.properties

Just as the properties coming directly from Ice.Config are
published to System.properties, this allows publishing all
properties (etc/omero.properties etc).

Primary motivation for doing this is to have the omero.data.dir
related properties available in logback.