Allow importing more than 1 style at once
(cherry picked from commit 6cc5b5b7a9e1d59042f4887d05ae7691ef66ba35)
tiff: selectable compression

compression is now selectable:
- uncompressed
- deflate (our old default)
- adobe deflate
- adobe deflate (float)

both compression and bitdepth are now implemented via
comboboxes as opposed to radiobuttons.

we also switched to little endian tiffs as oppossed to
big endian tiffs.
(cherry picked from commit 89c4d864645d75981e38afa076674d869cf8fccb)