Create UI Class [id=66302]

Fixed a bug in  main.Interactive.save_config_to_file:
There are two possible cases before trying to save config to file: open
in read mode and file closed. To avoid troubles, the config file needs
first to be reopened  using inout.FileHandler.reopen.
Side Effects: This fix breakes one of the unit tests. I needed to delete
it for now, because now it is harder to get a False state.
TO DO: Create new test case for the False state. This will require to
somehow raise IOError while executing reopen function.