Handy Calculator

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1.8: Improvements to RPN mode.
1.7: Added a Reverse Polish Notation (RPN) mode which can be selected on the settings page.
1.6: Allow entry of numbers starting with a leading decimal point.
1.5: Correctly handle the decimal and group separators used in different locales.
1.4: Make function buttons smaller than number buttons.
1.3: Make buttons look more 3D. Bug fixes.
1.2: Added row of buttons. Make main page of app fill phone screen.
1.1: Added linear equation solver and triangle solver tools.