Revise OK/Cancel/Apply button order on a few final dialogs [1]
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.2

  Old Button Order (RW 7.0): OK, Apply, Cancel
  New Button Order (RW 7.2): OK, Cancel, Apply

Willard had applied this button order change to most RiverWare dialogs, 
for RiverWare 7.1.  This completes this change for all dialogs we've 
discovered that lacked this change.

  (1) Geospatial View Canvas Config
  (2) Diagnostics Settings
  (3) Plotting Axis Config
  (4) GUS panels (buttons are shown only in the final panel).

Of these, the only tricky one was the "Geospatial View Canvas Config".
The use of the QDialogButtonBox was interfering with being able to place 
the three buttons in the desired order AND turn off auto-default operation 
on all three.  (This dialog has entry widgets, so it's annoying to have 
any buttons auto-defaulted).

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