Protocols: Allow for PseudoDojoFamily pseudos

[mbercx]

Currently the get_builder_from_protocol() method only queries for
pseudopotential families of type SsspFamily. Here we also include
the PseudoDojoFamily class in the query, so these pseudo families can
also be used for the protocols.

[mbercx]

@sphuber currently the PseudoDojoFamily isn't used in any of our defined protocols, so these changes aren't that useful unless the user changes the protocol in the .yaml files (which I'm doing for the common workflows). However, in the future it might be nice if the user can provide a protocol via a .yaml file instead of only the ones we have hard-coded. What do you think?

[mbercx]

Another thing to note here is that our current code for the protocol does not allow us to use different cutoff stringencies, which is more of an issue for the PseudoDojoFamily, as it ships with 3 different stringencies.