Fix cached thumbs bug in SPW. See #10827
Fix NetworkChecker hangs on Linux (See #10824)

Rather than attempting to connect to o.org.uk from Linux clients,
we attempt to use the Java 1.6 classes via reflection. If the
client is running on Java 1.5, the network is always assumed to
be up. This may cause deadlocks on changing networks for
Linux+Java 1.5 users, which will have to be clearly outlined in
the release notes.

For the more far more common cases, however, this should be work.
Fix return value as seen by @jburel
Minor cleanup
Reduce verbose System.err as seen by @zeb
Update submodules
Merge pull request #1129 from snoopycrimecop/merge/dev_4_4/submodules

Update dev_4_4 submodules for quick release. Bio-Formats 4.4.8 is just a version bump.
Merge pull request #1128 from joshmoore/10824-reflective-network

Fix NetworkChecker hangs on Linux (See #10824)
Merge pull request #1127 from will-moore/spw_thumbs_10827

Fix cached thumbs bug in SPW. See #10827
Merge commit 'v.4.4.8'