Update the format of saved_attributes configuration

See merge request !30

A bit of test-driven refactoring

See merge request !25

update_saved_attributes: remove hard-coded top group name

See merge request !28

dummyTangoDevice: allow parameters for `dummy_func`

See merge request !27

Allow the user to provide a step size for the widget in the client config

See merge request !26

Implement update_saved_attributes.py

See merge request !24

discard units from Tango devices when they are not defined in pint registry

See merge request !23

It is useful when one wants to dump an existing model from an h5 file.

It takes existing records and update them with new keys from a config