postprocess.cleansplit() does not honor the data type (e.g. np.float32)

[teuben]

in the GBT-EDGE pipeline we now use griddata(...,dtype=np.float32) and this indeed produces BITPIX=-32 cubes.

However, we then use postprocess.cleansplit() which then produces cubes with BITPIX=-64.

Perhaps pedantic, but besides wasting space, karma (kpvslice) cannot handle it. I'll obviously check if I can solve it easily from my end, until then it's an issue.

Reference: teuben/GBT-EDGE#4