Add the parameter 'page_help' at the root of the configuration allowi…

…ng to page help.

This is done by replacing the value of the default 'help' action by the object
use by the 'page_help' action ('HelpPager').

clg.py

@@ -392,6 +392,10 @@ def __init__(self, config, keyword='command', deepcopy=True):
         self._parsers = OrderedDict()
         self.parser = None
 
+        # Allows to page to all helps by replacing the default 'help' action.
+        if self.config.pop('page_help', False):
+            ACTIONS.update(help=HelpPager)
+
         # Manage the case when we want a help command that prints a description
         # of all commands.
         self.help_cmd = self.config.pop('add_help_cmd', False)