PICARD: crop images to 90 arcsec, delete temp files

Some updates requested by users - the input maps are now trimmed to a
circle of radius 90 arcsec before analyzing. Documentation for
changing this value via a recipe parameter has been added.

Intermediate files are now deleted.

The documentation for the ITC_F parameter has been removed as it is
calculated automatically as part of the analysis to ensure
self-consistency.
PICARD: add new values to log file

New values added to the log file: mean elevation, zenith 225 GHz tau,
ratio of map and ITC RMS values, ITC "f" parameter, map radius and
pixel scale.

Note that the ITC "f" is now calculated automatically from the pixel
scale of the input map.