fix failure on stack paste
fix crash on restart due to units reloading
remove unused imports in fragment classes
add modes selector (WIP)
use match_parent instead of deprecated fill_parent in layouts
radix selection
canonize resource definitions in xml files
add space between number and unit
add angle units support for trigonometric functions
add reverse trigonometric operations
handle angle unit toggle button click
add category tags to predefined units
add alt-toggled reverse triginometric buttons
convert superscripts to HTML for better view
cleverer units simplification, use it for units operations + Unit.NONE contant
coercion works with unit numbers
floats respect other types
implement undo (WIP)
unwrap unit numbers during coercion if both has none unit
rename UNumber.wrap() to UNumber.valueOf()