Overview of changes in gcalctool 5.21.1

* Work on bug #485919 - Use Glade for UI.
    > Adds support for the mode panel.
    > Puts menu accelerators back again and fixes the top button row in
      basic mode being too tall.
    > Now provides Glade support for the majority of the gcalctool GUI.

* Fix for bug #490701 - base radio buttons initially fail.

* Attempted fix for bug #485134 - OR calculation produces incorrect 
  result in arithmetic precedence mode. This isn't a complete solution
  so the bug has been reopened.

* Fix for bug #488828 - Reciprocal remembers backspaced items.

* More work on bug ##488694 - [a11y] Several calculator buttons don't speak 
  correctly with Orca. Removed the accessible descriptions (not needed) and 
  adjusted the "shift left" and "shift right" names (they were reversed).

* Patch to stablize arithmetic precedence.

* Stop acting on toggle events from radio buttons when they go inactive 
  (Bug #485918).

* Added Robert Ancell to the list of gcalctool MAINTAINERS.

* Fixed bug #488830 - Hex radio button shortcut conflicts with Help menu 
  shortcut.

* Fixed bug #488829 - Accuracy and Change Sign have wrong tooltip shortcut 
  keys.

* Fixed bug #488783 - memory registers not available if you start in 
  Advanced mode

* Fixed bug bug #488694 - [a11y] Several calculator buttons don't speak
  correctly with Orca.

* Fix for bug #485398 - Put memory register window inside the main window.
  Uses gtk_window_set_transient_for() to associate the memory register
  window with the main gcalctool window.

* Fix for bug #383850 - [doc] New names for Precedence.

* Fix for bug #485137 - Undo/Redo don't work in arithmetic precedence mode
  if user has "hand edited" the display.

* Added a call to "set_memory_toggle(v->rstate);" in make_frames() to
  correctly set the state of the Edit-<Memory Registers check box if the
  user wanted the memory registers initially displayed.

* Correctly handle memory register display and "Memory Registers" menu
  item checkbox status when user goes from Sci/Fin/Adv mode to Basic.
  (Needed because of the recent changes for bug #478961).

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Overview of changes in gcalctool 5.21.0