Lift methylation meta job to WFMS level

[vinjana]

The methylationcalling meta job starts bisulfite calling processes with bash -- always in pairs of largest (front) and smallest (back) chromosome. This has a number of disadvantages

• Chromosomes are processed sequentially (in pairs), which increases the throughput of the workflow.
• The batch processing system's scheduling is not exploited. Instead manual scheduling is used!
• There is job-management code in Bash (argh)
• Checkpointing does not work correctly (Why restart both chromosomes, if only one chromosome should be restarted?)

This job should be done by the workflow manager! Move the logic from the meta job into the workflow manager!