preps for heat1d example
added generate_hierarchy to step class -> manual creation of levels is not needed anymore, but possible (backwards compatibility)
Started implementation of parallel method..
Ongoing infrastructure work for serialized PFASST
infrastructure WIP
WIP virtual pfasst
very first version of virtual PFASST seems to work now.. many fixmes, many todos, many open questions!
* removed init prolongation again, transfer is now simpler
* fixed multilevel prolongation (hopefully)
* pfasst seems to work now in block-mode, needs some fixes and cleanup
removed slots from pfasst_serial, added first flag to step
bugfix for predict, introduction of sending and first/last notion
fixed send and recv, now checking for sanity (only recv values from current iteration)
generator function for blocks of steps
minor bugfix: send during IT_DOWN
joined MLSDC and SDC.. MS-SDC not working
MS-SDC seems to work now as well (has iteration counting issues, though)
bugfix for iteration counts of SDC and MS-SDC
some fixes for active_slots, minor cleanup
3 level setup does not run yet
fixed ugly send bug, multiple levels seem to work now
minor fixes, encap of block restart
changed signature of pfasst_serial (make better use of prev)