RPNCalcN

Aug 20, 2018

Bug Fixes
- Handle restorePreferences format mismatch gracefully
- Crash on not, Another crash on round
- Allow entering decimal seconds (milliseconds) in time mode
- Nan draws as 0+e (for example, -2 sqrt)
- a+b/2^c does a+b/c instead
- clean up fraction rendering engine
- 111111111-1 (11 1's) crashes a+b/2^c mode
- Undo when entering a number does not render the tos because it is behind the number
- Added alpha CAS polynomial algebra keyboard and display
- Updated help