slicing_dim renamed to slicing_axis
First implementation of separated controller/view
multiple interactive windows working
detached controller
added handler classes
partial support for clipping
added clip, colormap, colorbar, locate
new visualizer module
changed logging
renaming
added window title
sligthly changed interface
list functions
partial implementation of close_uis
added base_handler_mixin
Removed visualizers package
bug fixing
working on close
read_cube(label=...) expression
expressions for input/output cubes

Closes #28