srctype not exported correctly on save

[Malte Marquarding]

Signal-reference data taken at Mopra have an OBSTYPE record in the
RPFITS header that records 'RF TR' for reference scans, and either
'SC' or 'TR' for signal data.

However, this information is lost after passing through ASAP since
it only records obstype in the scantable header, thus only allowing
one value for the whole observation.  As livedata uses obstype to
distinguish between signal and reference integrations it cannot
process this data.

Can you modify ASAP so that a separate obstype is stored for each
integration in the scan table?

Regards, Mark