Bugfix (import style, capitalization) (#7)
Change behavior of AddCorr2Kwargs to fit with LSST config requirements (#7)

Change AddCorr2Kwargs to only return the dict keys of interest, not to write them as a new key in the same dict, since LSST config requires all value types to be the same basic type (eg string).
Fix column generation in hsc/base_tasks.py to return weight column as well (#7)