Error in reading pstokes beam

[steven-murray]

There is currently an error when reading the HERA_NF_pstokes_power.beamfits beam from the data directory, under pyuvdata>=2.2.9 (i.e. the currently the latest). The error seems to be that the beamfile inherently has complex data, while the UVBeam object is expecting float data since it's a power beam. I don't know enough about the pstokes beam file to know whether the file itself needs to be fixed, or whether this is an error in the expectation of UVBeam.