Add some tests for Archive's validators

Test whether validation succeeds in cases where the validated inputs are
null or blank. Tests are currently failing for values that should be
allowed to be null.
Test slugs are being saved and stored correctly
Pencil in schema for Archives
Order index by username ASC
Add alerts and update types to notices
Move save filter out of init
Show recent software update notices on home page
Add monthly reports page showing software updates
Show archive contributions on reports page
Sort contributions by controller, then title
Add archive classification to monthly report