install with Python 3.10

[bencrabbe]

I would like to report a minor issue when installing pydatalog with python 3.10.

pip install or python setup.py install

fail due to an update in the python library. The failure occurs in UserList.py:

class UserList(collections.MutableSequence):

where the newer versions of python require collections.abc.MutableSequence rather than collections.MutableSequence