namespace handling fixes

Override the correct method, when handling NAMESPACE property.
Removed unused arguments.
fixed options renaming, when ARG_ARRAY_SUFFIX is used
formatting options moved to Configuration

Also --csv parameter made into --lister-format.

Made help more synoptical - arguments grouped by context.

Correctly handle boolean values when overriding configuration options
with regard to None parameter.
pylint fixes

variable/function renames, doc strings added
allowed to specify url of hosts with credentials

Urls can now contain credentials, for example:
  http://user:password@hostname:5988
User then won't be prompted for username or password.
bumped version to 0.2.0