Feature/ts systems
Removes the 'edge' param and replaces it with a 'systems' parameter. Possible values for TCV are 'main','edge' or 'all'. Note: *_rho requests with LIUQE FORTRAN remain broken (mismatch in rhotor and rhovol sizes).
Needs to be merged after !61 (merged) (or we just close !61 (merged)).
closes #26 (closed).