add gatherv replay action (bigdft can be replayed easily now)
leaks --
It's ok to pass NULL to xbt_free.
Compare files.

Looks like it was forgotten in commit e9befaced39d9f668fb9de3bfbc37dc7ac7cf2de.
Cache cfg parameters smpi/{cpu_threshold,running_power}.
A value of -1 for smpi/cpu_threshold means infinity.
Use infinity (-1) for smpi/cpu_threshold in tesh files.