Default just the date MM-YY to 00-00

00:00:00 is a valid time, so we need to restrict our datetime-range matching
fix to just setting MM-DD fields to 0 in the database.

E.g. if the user supplies '2012' we write 2012-00-00
This will match a search for "..2012-01-01" (as lift_embargoes does)
Use mysql_enable_utf8 to utf8 encode DB strings

According to NYTProf calling {dbh}->{Driver} is really slow, plus DBD::mysql
gives us a utility to enable utf-8 anyway.