more general run sequences need to be supported

If the following occurs in CMEPS **an error will be triggered**. The run sequence generation needs to be generalized to allow for these cases:

1. `atm_cpl_dt > ocn_cpl_dt:`
This is the case for a C compset right now in cpl7, where datm couples every 6 hours but the ocean couples every hour.
This is current not a generated run sequence and needs to be supported.
2. `rof_cpl_dt < ocn_cpl_dt`
This also occurs in a C compset configuration for cpl7.

The error is triggered in `runseq_general.py`.