BASIL options

[mcraig-ibme]

e.g. --infert1

The most common ones should be supported as CL options. Also, there should be provision for a file containing extra options so we don't have to add every possible model option to the list of valid CL arguments.

[mcraig-ibme]

Have added --basil-options (or --fit-options) to point to a file containing extra options explicitly for Fabber.