New code

Done for the day after this (observing tonight)

two new procedures:
alignment_offsets_to_ncdf.pro
calcoeffs_to_ncdf.pro

they're really easy, very nearly one-liners. Once they've been used once, you can just use ncdf_varput_scale


Modified keyword parameters in do_the_pointing: offsets will always be applied unless the keyword 'no_offsets' is passed into the code (or the top-level wrapper). Since offsets default to zero, this should be OK.