update version and name to show alpha state
reset title from string resource
fix action bar not reset on back button pressed
make keypad rows distribute evenly vertically
initialize and load a predefined set of units on app start
add gravitational constant (a constant with a unit)
make lines distribute more evenly vertically
make stack view multiline
fix vertical inconsistency layout problems (at last)
implement units simplification and inner representation methods (WIP)
hide action bar for main view