Trestle: fix optimal tile sizes for subresolutions
TIFF: actually return the tile height

Caused by 64f33a89e3277a5c9a6d1bb6cbcd546e6f3a9b95.

This may be the most stupid bug that I have ever introduced.
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 444 (ScanR: fix well linkage issues)
merge dev_4_4 -D org -I include -E exclude: PR 445 (TIFF: correct for invalid tile heights)
merge dev_4_4 -D org -I include -E exclude: PR 450 (Trestle: fix optimal tile sizes for subresolutions (rebased onto dev_4_4))