Log Message:
Update devel/py-argcomplete to 1.6.0.

1.6.0
- Add support for tcsh
- Fix handling of unquoted completions containing $
- Don't insert unnecessary leading quote char in completions
- Fix parser reuse with positional arguments
- Tests: Add simple pexpect tests for bash; Add test case to
  verify #20 is fixed

1.5.1
- Packaging fix

1.5.0
- Do not suggest options from mutually exclusive groups