Added many more options for data processing.
Added many more options for data processing.

Restructured old-style "action" list so that arguments are more uniform and less
scattered (e.g., date formats are specified directly within --date argument,
rather than in parallel with subset of -a arguments).

This commit moves towards solving issues #23 and #24; however, the script now
runs much slower than the one in master that it was branched from (commit
7606df1a38959c468b17df7fa97431937be04983).  Some Python profiling may be needed
to figure out exactly what changed.

ecohealthalliance/tangelo,ecohealthalliance/tangelo,aashish24/tangelo,ecohealthalliance/tangelo,Kitware/tangelo,aashish24/tangelo,mathstuf/tangelo,mathstuf/tangelo,Kitware/tangelo,aashish24/tangelo,Kitware/tangelo,mathstuf/tangelo