FEATURE: Deal with restarts when the abinit process is killed by python

[davidwaroquiers]

In the abinit jobs, the abinit process is killed before the end of the wall time by the python subprocess module. We should try to deal with those cases. In some cases, an automatic restart may be possible. In some other cases, the user should do something (e.g. increase timelimit, or change number of processors or else ...).