FormatReader: clear the 'core' variable

Suggested by Curtis Rueden.
Zeiss CZI: tidy up metadata hashtable keys
Fix the Imaris metadata page
Make sure that SizeZ/SizeC/SizeT are set for single-file exports
Deltavision: make sure that the DetectorSettings.ID is set

See QA #4877.
Metamorph: look for the channel count in one more place

Reported by Stéphane Dallongeville.
Remove hard dependency on log4j from core Bio-Formats/SCIFIO
Remove loci.formats.utests.tiff.OMETiffWriterTest

All this test does is check for open file handles; we now have much more
comprehensive tests that cover the same thing (and without depending
upon log4j).
Remove commented-out log4j code from the ome-io component

These classes are beyond obsolete anyway, and will likely be removed in
the next major release.
Merge pull request #363 from rleigh-dundee/lif-usercomment-dev44

Backport of PR #305 to 4.4
Merge pull request #367 from melissalinkert/cxd-dimensions

.cxd dimension detection fixes
ICS writer: fix support for writing RGB images

Reported by Harri Jäälinoja:

http://lists.openmicroscopy.org.uk/pipermail/ome-users/2013-February/003529.html
Merge remote-tracking branch 'origin/dev_4_4' into logging

Conflicts:
	components/scifio/test/loci/formats/utests/tiff/OMETiffWriterTest.java
merge dev_4_4 -D org -I include -E conflict -E needs-fixes -E broken: PR 368 (Remove hard dependency on log4j)
merge dev_4_4 -D org -I include -E conflict -E needs-fixes -E broken: PR 373 (Sprint5 bug fixes)
merge dev_4_4 -D org -I include -E conflict -E needs-fixes -E broken

Repository: openmicroscopy/bioformats
Updating 3f142f7..7c0f9d5
Merged PRs:
  # PR 368 melissalinkert 'Remove hard dependency on log4j'
  # PR 373 melissalinkert 'Sprint5 bug fixes'

Generated by OMERO-merge-stable#155 (http://hudson.openmicroscopy.org.uk/job/OMERO-merge-stable/155/)