Enhance the coding style and consistency.

[Tobias Schlauch]

There are a lot of small coding style issue in the code base which shloud be fixed:
- Create a adapted pylint configuration: Basically, change to camel case!
- Run pylint over the code base.

Here are some example issues (Special thanks to Mark!):
- A few lines still finish with a semicolon:

src/webdav/WebdavClient.py:235: self.connection.logger.debug("Copy to " + repr(toUrl));
src/webdav/WebdavClient.py:266: self.connection.logger.debug("Move to " + repr(toUrl));
tests/AuthentificationTestCase.py:53: self.testListResources();
tests/ClientTestCase.py:94: child= self.resource.addCollection("new");
tests/ClientTestCase.py:117: child= self.resource.addResource("new", "Binary Content", {('TENT:', 'feature') : "X4711"});
tests/ClientTestCase.py:137: child= self.resource.addResource("new");
tests/ClientTestCase.py:154: child= self.resource.addResource("new", "Binary Content");
tests/ClientTestCase.py:177: child= self.resource.addCollection("new", token);
tests/ClientTestCase.py:219: child= self.resource.addResource("new", "Binary Content", {('TENT:', 'feature') : "X4711"});
tests/ClientTestCase.py:239: child= self.resource.addResource("new", "Binary Content", {('TENT:', 'feature') : "X4711"});
tests/setAcls.py:39: '</D:%s>\n' % TAG_ACE;

- Many lines also finish with whitespace

[Tobias Schlauch (tobias-schlauch)]

Added pylint build target and corresponding pylint definition.
Created a CI build.

[Tobias Schlauch (tobias-schlauch)]

Problems in 'webdav.Connection':
- There's still a spurious space at the end of
self.logger.debug("Exception occurred! Retry... "

- "# The following switch activates a workaround for the Tamino webdav
server:" -- err, which switch?

- The canonical form is "UTF-8" (not "Utf-8") -- I mean this for
your comments, not for variables etc. (more generally the case of
abbreviations/proper names does not seem to be very consistent)

- Similarly there should be a space after "ISO" and "RFC", except
in variables etc.

[Tobias Schlauch (tobias-schlauch)]

self.logger.debug("Exception occurred! Retry...", exc_info=True)
raise WebdavError("Cannot perform request.")

Surely this is not retrying, as it immediately raises an exception?