Force users to specify filter criteria

[jace]

Hasjob currently displays only the last 24 hours of jobs to anonymous users, unless they specify filter criteria, in which case the 24 hour limit is removed.

A prompt at the bottom of the unfiltered home page requests the user to login. What if instead if prompted the user to specify filter criteria? Would users respond by doing that? If such a prompt works, the 24 hour limit could be applied to logged in users as well, to encourage more page inventory for #165.