Made threading of authentication on the database an option, via -t or --threading. Expect most people to want to use that option.
Added Statistics page for elliptic curves over Q
Merge pull request #16 from JohnCremona/master

Add Statistics page for elliptic curves
EC: url_for link for statistics
Merge pull request #15 from pdehaye/master

optional threading for authentication; fixes threading issue like a miracle, too.