Overview of changes in gcalctool 5.21.3

    * Added a "Reset to Default" accuracy menu item (bug #488542).

    * When the bit calculation extension is enabled, a message now appears
      in the status bar.

    * Fixed bug #500060 - Twiddling bits 32-63 in bitcalculation extension
      produces incorrect results.

    * Fixed bug #367731 - [doc] Update documentation for bit calculating
      extension.

    * Fixed bug 500029 - Clearing a bit in the bitcalculating extension,
      sets the display to zero.

    * Disable menu items not valid in current mode (Bug #499625).

    * Fix build dependencies for parsers (Bug #497237).
    
    * Trim pasted text on newlines, replace tabs with spaces (Bug #488796).

    * Fixed bug #367737 - [doc] Documentation screenshots need to be updated.

    * Fixed bug #367723 - [doc] Update documentation for Changing Modes
      Clears Calculation.

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