moving from optparse to argparse. Major difficulty is

that argparse does not have Option objects -> added class Argument
Needed explicit call of MyOptionParser.format_epilog as argparse
does not have that. The parse_arg epilog argument wraps the text,
which is not the same (could be handled with a special formatter).

- parser.parse() now returns single argument (with positional args in
  .file_or_dir)
- "file_or_dir" made a class variable Config._file_or_dir and used in help and tests
- added code for argcomplete (because of which this all started!)

addoption:
- if option type is a string ('int' or 'string', this converted to
  int resp. str
- if option type is 'count' this is changed to the type of choices[0]

testing:
- added tests for Argument
- test_mark.test_keyword_extra split as ['-k', '-mykeyword'] generates argparse
  error test split in two and one marked as fail
- testing hints, multiline and more strickt (for if someone moves format_epilog
  to epilog argument of parse_args without Formatter)
- test for destination derived from long option with internal dash
- renamed second test_parseopt.test_parse() to test_parse2 as it was
  not tested at all (the first was tested.)

--HG--
branch : argparse

_pytest/hookspec.py

@@ -23,7 +23,7 @@ def pytest_cmdline_preparse(config, args):
     """modify command line arguments before option parsing. """
 
 def pytest_addoption(parser):
-    """register optparse-style options and ini-style config values.
+    """register argparse-style options and ini-style config values.
 
     This function must be implemented in a :ref:`plugin <pluginorder>` and is
     called once at the beginning of a test run.