Support for aquadivelog UDDF import

This implements limited support for importing dives from a Palm divelog
software called aquadivelog. Basic depth graph is imported but most of
the metadata is currently discarded.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Disable Document Mode for MainTab on MacOSX

Commit c4f06dc536392e31a477e592d30fb946f1499595 introduced Document
Mode on the MainTab QTabWidget. This doesn't look good on MacOSX.

Signed-off-by: Henrik Brautaset Aronsen <subsurface@henrik.synth.no>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>