Show "State loaded" and "State saved" messages in the status bar

... instead of using message boxes (J configuration) or sometimes displaying
nothing (K configuration).
Merge the Search Settings dialog
Default "Try all gens first" option to On in all configs
Trying to make sense of cell ordering
Make the "middle columns first" option be one of the sorting options
Slightly rearrange the Search Settings dialog box
Disable shift/flip features when a diagonal selection is present

... since we don't support that.
Support "shift gens to past/future" with diagonal selections
Fix display glitches when changing gen while there is a selection