Add a `nforms` field to the Experiment

This specifies how many forms have to be taken into account
Remove the m1 and m2 fields from the ExperimentReport type

They can be easily calculated from the `distribution`
Set the cputime         unlimited
filesize        unlimited
datasize        unlimited
stacksize       8MB
coredumpsize    0kB
memoryuse       unlimited
maxproc         1024
descriptors     1024
memorylocked    64kB
addressspace    unlimited
maxfilelocks    unlimited
sigpending      30646
msgqueue        819200
nice            0
rt_priority     0
rt_time         unlimited field in the default options