POWER calculations with BM not integrated in Psi

[aps-7bm]

I was recently trying to use POWER to compute the filtering of a BM beam through an aperture in OASYS. POWER seems to only allow such calculations if the data were fully integrated in Psi. I believe that XOP allows calculations with flux integrated over a finite region of Psi. Is there a reason for this limitation?

[srio]

should be ready for the next version - to be tested