MoL multi-rate support is broken

MoL does not do the initial copy of the past timelevel (which the driver just rotated into _p) to the current timelevel. Hence the current timelevel retains the values it had when it was the past-past (assuming three levels) timelevel (or poison if poisoning is used).

The attached patches do (1) add the required initial_copy and (2) add support for MoL::initial_data_is_crap to the slow sector.

Keyword: MoL