Started a script to read old XML parameter files and create equivalent parameter databases. It imports model.py and uses Django functions for all object creation, no direct SQL manipulation. This script will be used to migrate the automated test suite, but it may also serve as a useful example for other tasks where we want to create a parameter database programmatically.
Merge branch 'master' into SQLite
Minor: get_int now defaults to 0, get_boolean to FALSE.
Now reads disease-model and airborne-spread-[exponential-]model elements from the XML. Supports only "Point" PDFs so far.