In dynk_parseSET, added check that the specified function is actually valid.

Beginning of dynk_computeFUN() implementation. Debugging probably still needed (not tested).
For some reason, if I put a write(*,*) statement in the function, it gets stuck (0% CPU) with the following backtrace:
where data_transfer_init() seems to be related to gfortran's write(*,*) and read(*,*).