Arrival times observation

[mcraig-ibme]

From Tom. Not completely clear what this is about but to investigate:

"Somewhat confusingly, oxasl with pvec outputs arrival time maps anyway with the default aslrest values (0.7 and 1.0 respectively). Had me pretty concerned for a while trying to work out why it was ignoring my commands, but it seems to simply chuck them out by default. The logfiles for basil do at least show the right numbers."