ScanR: fix well linkage issues
TIFF: correct for invalid tile heights
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 pull request #444 from melissalinkert/scanr-well-indexes

ScanR: fix well linkage issues
Merge pull request #445 from melissalinkert/tiff-tile-height

TIFF: correct for invalid tile heights
Merge pull request #450 from melissalinkert/rebased/dev_4_4/trestle-tile-sizes

Trestle: fix optimal tile sizes for subresolutions (rebased onto dev_4_4)