add channel object
initial implementation of channels class
add initial dialog
add possibility to manual test it on non-s390
Added a stub spec with Version for rake

without this, any rake invocation fails with
  can't convert nil into String
fix path to yast2
initial attempt to filter items
fix filtering
use multiselectin table
fix tests
more ui improvements
more readable iteration over map (thanks to @mfilka)
align hash
replace deprecated syntax
allow modification of tested data
add ability to blacklist channel
initial version of unban dialog
add initial range unbaning
Add partial channel range specification
add Range of values