Fixed: Silence the needless unnittest warning

Needless because there are no tests.
Fixed: Set six-hour session expiry

Previously, sessions were valid for two weeks, persistent across browser closes.
That's ridiculous, and it did result in users being confused about why their
sessions didn't clear out. So now it's a new session either every six hours, or
every time you close the browser.

Closes #20
Fixed: Table output template referred to outdated VIS release

Previously, the table output said it was produced by "VIS X." Not only was that
never true, but CWA users needn't necessarily know about the Framework.