Fix freq interpolation in OTF mode
Fix cube/mfs detection
Allow higher order spectral models
fix reffreq type and check for flagged bins
Alter the mfflux option for uvfmeas to output the right values to use with
the new mfcal and mfboot flux option.
Fix issue with uvfmeas not matching the flux measurement system of
mfcal and uvsfit, which both use natural logs rather than log 10.
Fix mfcal so it can still work with options=delay when the model flux
is specified.
Make less verbose in nodisp mode
cope with HPX rotation