[daip] phase rotation

[Andy Biggs]

Hi there. I'm trying to use UVFIX to move the phase centre of a dataset 
and it seems to be working fine as far as I can tell. As usual though, I'm 
confused by the UT1-UTC and the IAT-UTC parameters - do these need to be 
set? I'm asking because presumably what I'm doing with UVFIX is what IMAGR 
does when you use the DO3DIMAG option, but I don't suppose IMAGR knows 
what UT1-UTC, etc are. My question directly relates to how I do the shift 
when I have a dataset consisting of multiple epochs DBCON'd together. They 
may have very different values of UT1-UTC and IAT-UTC.

Cheers,

Andy