SCUBA2: add WIDTH and HEIGHT parameters

I initially thought it would be possible to get by with just using
recipe parameters, but found that sometimes you do have to provide
your own defaults.
PICARD: add WIDTH and HEIGHT input parameters
PICARD: crop images to 90x90 arcsec^2 by default

Since this recipe is supposed to enable direct comparison with
pipeline results, it should use the same parameters for various
actions such as cropping. The pipeline uses 90 arcsec so this recipe
should do the same.