Use official JDK5 build of AssumeNG
Remove instances of assumeng-1.2.3-jdk15
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.
ICS writer: fix support for writing RGB images

Reported by Harri Jäälinoja:

http://lists.openmicroscopy.org.uk/pipermail/ome-users/2013-February/003529.html
Remove last instance of "assumeng-1.2.3-jdk15"
merge develop -D org -I include -E conflict -E needs-fixes -E broken: PR 342 (setId performance improvements)
merge develop -D org -I include -E conflict -E needs-fixes -E broken: PR 351 (Add SPW support to FakeReader)
merge develop -D org -I include -E conflict -E needs-fixes -E broken: PR 374 (Add method to retrieve the significant directory count)
merge develop -D org -I include -E conflict -E needs-fixes -E broken: PR 377 (Update AssumeNG to official build)
merge develop -D org -I include -E conflict -E needs-fixes -E broken: PR 378 (Sprint5 bug fixes (develop))