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.
LIFReader: Add User-Comment tags to the series metadata
XMLTools: sanitizeXML does not strip newlines
NativeND2Reader: Don't call sanitizeXML on non-XML data

Add separate sanitizeControl function to handle text.  It's
internal to this reader at the moment, because its replacement
rather than removal of characters does not match the behaviour
of the other helper functions in DataTools, and this reader is
currently the only user.
Update version numbers to 4.4.7-{DEV,SNAPSHOT}
Merge pull request #366 from melissalinkert/4.4.7-dev-version-number

Update version numbers to 4.4.7-{DEV,SNAPSHOT}
SimplePCI: better calculation of Z/T dimensions
SimplePCI: do not populate more timestamps than planes
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