Made the crawling more efficient. Implemented help.

Now it doesn't crawl the whole directory for every single mail anymore. That was
insane. It's now possible to give a maildir_scheme in the config file where a
maildir name can be given. This is usefull with more than one account.

Also the search for the filename is a little bit more efficient. Mailpathes
already found are kicked out of the search.
Added -vv verbose verbosity
Displays FROM and SUBJECT header when -vv very verbose
made its.py +x and little bugfix on verbosity
Now parse_courierdb considers also double marked emails.

If an email is marked as spam AND ham at the same time, it is declared as none
of both.

Also it is possibly slightly faster... but that's not fure sure. Have to test
this.
added little shipping out script
get_path_from_filename now always return full path

If a relative path was given, it only returned also a relative path.
Added wvtest suite.

The __init__.py is necessary to import its.py into test.py
Added simple README file.
Forgotten to add actual testdata
fixed little bug when matching database path
Added testdata
Now handles more than on keyword for spam and ham

There is also an option for case sensitivity now.
Corrected its.default.conf
corrected little typo in its.default.conf