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
The preview text displayed in the previewEdit widget was the text of
the content opened from the wiki, and not the text entered by the user
in the contentEdit widget.
- content preview's html code is now cleaner
- ICapContent.preview_content() renamed to ICapContent.get_content_preview()
- tab "preview" was shown first when starting qwebcontentedit. Fixed.
