Correct reference to unset property.
Review saving improvement: Only report unready review if review unready.
Formula fix: Allow changing old formulas.

bugs bugs bugs bugs bugs
Formulas: Review loops compile to integers.

Specifically 'sum(tag:whatever)' will never display a check mark.
Also, "false" results display as empty, rather than 0.
Formulas: Add support for 'true' and 'false'.
Formula fix: Exploded scores are strings, so '===0' doesn't do what we want.

Need to '==0', and cast the score to an int.
Formulas: Add all() and any() aggregate functions.
Help improvements for formulas.
Formulas: Add 'isprimary', 'issecondary', 'isexternal'.

These return true if ... well the obvious thing. Matt Welsh request.