issue2551353 - Add roundup-classhelper for 2.4.0 release Changes to the classic template are not done yet. Still testing. This commit has document updates and changes to rest.py. rest.py: add /rest/data/user/role endpoint to core so the user doesn't have to add the /rest/roles endpoint via interfaces.py. It will only send roles for a user with Admin role and there is no way to override this currently. acknowledgements.txt: Added members of team3 to other contributors. Specified for all other contributes what they worked on. upgrading.txt: added classhelper section and basic template change directions. Linked to admin_guide for full directions. admin_guide.txt: documented install, translation, troubleshooting, config etc. user_guide.txt: added section on using the classhelper. Added reference to section earlier in the doc. Added image for section.

import operator

class MultiMapping:
    def __init__(self, *stores):
        self.stores = list(stores)
    def __getitem__(self, key):
        for store in self.stores:
            if key in store:
                return store[key]
        raise KeyError(key)
    _marker = []
    def get(self, key, default=_marker):
        for store in self.stores:
            if key in store:
                return store[key]
        if default is self._marker:
            raise KeyError(key)
        return default
    def __len__(self):
        return sum([len(x) for x in self.stores])
    def push(self, store):
        self.stores.append(store)
    def pop(self):
        return self.stores.pop()
    def items(self):
        l = []
        for store in self.stores:
            l = l + list(store.items())
        return l