Only change dive coordinates on double click

Apparently this only happens on Windows, but there we would change the
dive coordinates on a SINGLE click when editing a dive. With this change
we simply bail if the event isn't a double click.

Fixes #505

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Re-center on current dive if dive edit is canceled

If the user changes the coordinates for a dive but then cancels the dive
edit, the globe would stay at the location that was temporarily set and
not rotate back to the still active coordinates.

This fixes it.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Bump to Beta 3 / 4.0.98

Beta 2 didn't last long...

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>