Imaris: one more channel count fix

This is what 7c7d5b57a03e17e2c44625e24f09f585dc477dec should have done.
TIFF: prevent skipping beyond the end of the file
merge dev_4_4 -D org -I include -E exclude: PR 379 (Fix source code links moved to the scifio-tools foder)
merge dev_4_4 -D org -I include -E exclude: PR 405 (Zeiss ZVI: use coordinates to retrieve the correct plane (rebased onto dev_4_4))
merge dev_4_4 -D org -I include -E exclude: PR 408 (Fixes for March 2013 bug week)