Implement line number filter front-end

So that users can browse receipts and disbursements by the line they were reported on, add the line number filter to the front-end.

Implementation details:

[x] The filters should be in the "Receipt/disbursement details" panel under the label "Receipt type" or "Disbursement type"
[x] There should be three dropdowns for each type of form: House and senate committees (form 3), presidential (form 3P) and pacs/parties (form 3X)
[x] Each dropdown should include the plain text label of each line with the line number in parentheses
[x] When viewing contributions before 2007 the filters should be disabled and a message should be shown
[x] Each filter should generate a tag that includes the full text label + the type of committee that reported it, with line number in parentheses

fecgov / openFEC-web-app