Speeding up sqlite tests

[James Henstridge]

When running the sqlite based tests, I noticed that the hard disk light flashes almost constantly. This seems to be caused by the fsync() calls when committing transactions.

Issuing the command "PRAGMA synchronous = OFF" on connection creation cuts about a third of the runtime from tests/store/sqlite.py. It might be worth adding an option to the SQLite Database implementation for this and using it within tests (it can cause data corruption though, so it should not be turned on by default).

More details on pragmas can be found here:

    http://www.sqlite.org/pragma.html

[James Henstridge (jamesh)]

Fixed in r251.

[James Henstridge (jamesh)]

Fix released in 0.13.