Begin #149.  I got a "database is locked" error on the third iteration.  I couldn't find the error in the C code.
New Windows executable that only does 1 iteration if the -i command-line option is used. Requested in issue https://github.com/NAVADMC/SpreadModel/issues/149
Merge remote-tracking branch 'origin/master'
Commit to reproduce the "database is locked" error fro #149.  Start django server, then navigate to http://127.0.0.1:8000/results/RunSimulation/
Set a "busy timeout" for the database connection, that is, how long the database functions will keep retrying if the DB is locked. May help with issue https://github.com/NAVADMC/SpreadModel/issues/150
Merge branch 'master' into Windows