HPC PJM/Wisteria system module

[bch0w]

Yoshi Kaneko's group (@ykane @mishuyetsam) at Kyoto University has access to Wisteria, a Fujitsu-based cluster hosted at the University of Tokyo, on which they would like to run SeisFlows.

The Fujitsu system has its own workload manager that we'll call PJM, it seems to be very similar to PBS, but different enough that it requires its own submodule. We will have to overwrite the Cluster class and create a general PJM module, and a more specific Wisteria module.

Tasks to accomplish are therefore:

• Create a generalized PJM system module, which inherits from Cluster and provides interface for Fujitsu based workload managers
• Create a specialized Wisteria system module, which inherits from Fujitsu, that provides an interface for Wisteria
• Test using TestFlow and run one of the SPECFEM2D example problems

[bch0w]

This was added in #176