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/tools/application/base.py

@@ -33,7 +33,7 @@ from weboob.core import Weboob, CallErrors
 from weboob.core.backendscfg import BackendsConfig
 from weboob.tools.config.iconfig import ConfigError
 from weboob.exceptions import FormFieldConversionWarning
-from weboob.tools.log import createColoredFormatter, getLogger, DebugFilter, settings as log_settings
+from weboob.tools.log import createColoredFormatter, getLogger, DEBUG_FILTERS, settings as log_settings
 from weboob.tools.misc import to_unicode
 from .results import ResultsConditionError
 
@@ -314,7 +314,7 @@ class Application(object):
             return False
 
         print(u'Error(%s): %s' % (backend.name, error), file=self.stderr)
-        if logging.root.level == logging.DEBUG:
+        if logging.root.level <= logging.DEBUG:
             print(backtrace, file=self.stderr)
         else:
             return True
@@ -354,7 +354,9 @@ class Application(object):
             print(' '.join(items))
             sys.exit(0)
 
-        if self.options.debug or self.options.save_responses:
+        if self.options.debug >= self.DEBUG_FILTER:
+            level = DEBUG_FILTERS
+        elif self.options.debug or self.options.save_responses:
             level = logging.DEBUG
         elif self.options.verbose:
             level = logging.INFO
@@ -391,10 +393,6 @@ class Application(object):
         self._handle_options()
         self.handle_application_options()
 
-        if self.options.debug < self.DEBUG_FILTER:
-            for handler in handlers:
-                handler.addFilter(DebugFilter())
-
         return args
 
     @classmethod