logging: Create a new level DEBUG_FILTERS

This is a cleaner approach that requires less configuration
in other applications.
This also easily allows us to have another color.

Many checks were made on being exactly at the DEBUG level, they were
fixed to also check on being below DEBUG (i.e. DEBUG_FILTERS).

weboob/browser/elements.py

@@ -21,7 +21,7 @@ import re
 import sys
 from copy import deepcopy
 
-from weboob.tools.log import getLogger
+from weboob.tools.log import getLogger, DEBUG_FILTERS
 from weboob.tools.ordereddict import OrderedDict
 from weboob.browser.pages import NextPage
 
@@ -270,7 +270,7 @@ class ItemElement(AbstractElement):
             self.logger.warning('Attribute %s raises %s' % (key, repr(e)))
             raise
         logger = getLogger('b2filters')
-        logger.debug("%s.%s = %r" % (self._random_id, key, value))
+        logger.log(DEBUG_FILTERS, "%s.%s = %r" % (self._random_id, key, value))
         setattr(self.obj, key, value)