refs #803

autopep8 -i --select=W602
Also some other minor deprecated syntax changes, like "while 1".
I did not commit the less obvious changes.

refs #806

"line" redefined in list comprehension.

and PEP8 indent fixes

This is recommended by Debian.
closes #618

I used autopep8 on some files and did carefully check the changes.
I ignored E501,E302,E231,E225,E222,E221,E241,E203 in my search, and at
least E501 on any autopep8 run.

Other style fixes not related to PEP8:
* Only use new-style classes. I don't think the usage of old-style
  classes was voluntary. Old-style classes are removed in Python 3.
* Convert an if/else to a one-liner in mediawiki, change docstring style
  change to a comment something that wasn't really appropriate for a
  docstring.
* Unneeded first if condition in meteofrance

There is no reason to hide it from anyone, the GPG default is not
appropriate in our case.

stderr is shown and an exception is raised if GPG does not exit
successfully.

* Use directories mtime (so deleted or renamed files are taken into account)
* Set the tarfile mtime close to the version

Also add imports for Python 2.6 usage.