implement disruption time computation as internal method, as opposed to relying on the external disruptions table.
references on MFE WSs:
/usr/local/cmod/codes/mhd/magnetics/disruption_database/test_disrupt.pro
/home/granetz/Collaborations/DIII-D/disruption_database/test_for_disruption.m
/home/granetz/Collaborations/EAST/disruption_database/test_for_disruption.m
/home/granetz/Collaborations/KSTAR/disruption_warning_database/test_for_disruption_KSTAR.m
implement disruption time computation as internal method, as opposed to relying on the external
disruptionstable.references on MFE WSs: