Making bin/processCcdDecam.py executable
Renaming config/processCcd.py to config/processCcdDecam.py
Creating instcal, dqmask, and wtmap files in destination repository

Instead of only storing information in the repository on the instcal,
dqmask, and wtmap files that correspond to a visit, we instead define
data products and write/copy/symlink the input files to be the
destination data product.  This allows the butler to recognize that
datasetExists.
Reading DECam data from disk into LSST classes

Using the mapper to define storage templates for instcal, dqmask, and
wtmap, and a bypass_raw method to access each one of these in turn to
create the ExposureF corresponding to the visit,ccdnum combination.