W_AITPHO appears to be in foot-lamberts, not cd/m^2

From a pipe2d slack conversation, referring to the header from PFLA01635112.fits:

W_AITPHO=               12.444 / cd/m^2 at photodiode                   
HIERARCH W_AIT_SRC_diodeFlux = 42.633 / cd/m^2 at photodiode

I think the W_AITPHO value should be 42.633. That is the card we will be keeping.

Oh, while on this, could the cd/m^2 be put into the units field in the keyword dictionary entry?