Add support for array jobs for lxplus and gridka.

Add support for array jobs for lxplus and gridka. Only implemented in
the respective _batchelor files. Implementation in the main batchelor
class is still missing.
Add function for excluding hosts on gridka.

Add function for excluding hosts on gridka.
Implement submit array jobs.

Implement submit array jobs in main batchelor class. It is independent
of the classic submitJobs command. Currently the jobName parameter has
to be specified.