Some weboob core modules should not simply be copied just to backport
one symbol. It causes every class to be redefined even if they did not
change.

Instead, use some manual code backports for some of them.

Should close:
https://git.weboob.org/weboob/devel/issues/111
https://git.weboob.org/weboob/devel/issues/100

This will avoid conflicts like weboob.exceptions vs weboob.browser.exceptions.

After c4a87b34, CapBank has been
backported in modules along with an iter_resources method which does not
take the correct Account class, and thus all modules list no accounts.