Implement "Job" search (for "Advanced Search")

Implement support for searching on Job-related properties in the "Advanced Search" screen. The options should be broken up into separate search panes. (If separate panes are difficult, then feel free to propose a simpler alternative.)

• "Job"
• "Job: Hours"
• "Job: Pay"
• "Job: Pension"
• "Job: Healthcare"
• "Job: Leave Entitlement"
• "Job: Role"

The search options within each pane should come from the corresponding entities. For a list of searchable fields and suggested UIs, see the "Job" tab in the Google Doc. There's a column describing suggested search widgets for each field. (Some are blank - ignore those.)

https://docs.google.com/spreadsheet/ccc?key=0AujctkQuBowkdGxjSmJ3b0xYZHZXcVlXeF9hTHBFNGc&usp=sharing