LoadISISNexus does not process Periods

[OwenArnold]

The ISIS nexus loader hard-codes a single period log entry for each workspace-period. It is therefore not possible to apply any filtering on log values on multiperiod data loaded via this format.

To reproduce, load a multi-period isis nexus file and try to run something like the following:

ws = the second workspace in the group corresponding to period 2.

run = ws.getRun()

period_log =run.getLogData('period 2')

see the LoadLogs method in LoadISISNexus2.cpp, since the period is not provided, it uses the default argument of 1.

[OwenArnold]

This issue was originally trac ticket 5548