Merge branch 'misc-fixes' of git://github.com/DataBeaver/subsurface

Pull miscellaneous fixes, mostly UI stuff from Mikko Rasa.

Both this and the pull from Pierre-Yves Chibon created a "Save As" menu
entry and logic.  As a result, there were a fair number of conflicts,
but I tried to make the end result somewhat reasonable.  I might have
missed some semantic conflict, though.

Series-acked-by: Henrik Brautaset Aronsen <subsurface@henrik.synth.no>
* 'misc-fixes' of git://github.com/DataBeaver/subsurface:
  Add a separate "Save as" entry to the menu
  Changes to menu icons
  Improved depth info for dives without samples
  Divide the panes evenly in view_three