"informations" is incorrect; try to use a better word, or the invariant "information".

refs #1424

Since the date are now not always imported, it does not make a lot of
sense to not import all date utils

It removes the import of SSL in console applications (SSL -> socket ->
base64 -> ...)

Actually, the condition are not widely used. Do not load the datetime
module if we don't run it.

The import process of requests is very expensive: it imports all urllib,
and a lot of stuff. It is a problem on slow hardware, for applications
not running browser2 (example: weboob-config update).

This patch has two mains parts:
 * introduces load_browser to load a browser only if needed (a lot of repository
   processing does not need a browser)
 * Do not import exceptions of requests, but use Weboob internals one

Before: 6455 open/190 modules imported
After: 3997 open/112 modules

One of the goal is to not import all modules needed by filters by
loading the page file.

In the same goal, move the import of parsers in the class definition.

Laurent Bachelier authored Jul 01, 2014 and Romain Bignon committed Jul 05, 2014

And end up with less duplicate code!

Vincent Texier authored Jul 05, 2014 and Romain Bignon committed Jul 05, 2014

closes #1423

Signed-off-by: Vincent Texier <vit@free.fr>
Signed-off-by: Romain Bignon <romain@symlink.me>