Port all code to PEP8

We need to make all the code follow PEP8.

For this there is an useful tool in <branch>/phatch/other/pep8.py. You can run it with:
$ <branch>/phatch/other/pep8.py --repeat --count --show-source <filename>

More easy (but more slow) is to run an automatic script on all converted files from the 'tests' directory:
python run_pep8_test.py

To check which files still need to be converted run from the 'tests' directory:
python run_pep8_test.py --list

The policy is now reverted! By default all files should follow PEP8 now. So it is no longer necessary to add:
Follows PEP8