Added default MAGeT protocols to repository. Related to Issues #83 and #84.

When running MAGeT, these protocols should be specified for the --lsq12-protocol (default_linear_MAGeT_prot.csv) and the --nlin-protocol (default_nlin_MAGeT_minctracc_prot.csv) options.
Ideally, these protocols would be the defaults for MAGeT, and you could use them without specifying these options; however, I am undecided on how to implement this change based on the current framework for specifying protocols. In the meantime, I am adding these csv files and updating the documentation.