release 1.11.2

- when showing values with exponent, also adjust fraction
- redraw inside main loop; automatically called after error
- user variables to module; our %var removed
- main changelog moved to seperate CHANGES file

- modules filenames can contain class; only loads first of any class
- give command name as parameter to pre/postaction hooks
- postaction hook after running commands
- global redraw() to queue a stack/screen refresh