Convert incoming data model to allow for multiple assertions

[justincy]

Convert incoming data model to allow for multiple assertions on each attribute. This will allow for all info from a record or person to be pulled, such as multiple names or multiple spouses.

Each input will have to be converted into a combobox: hybrid between dropdown and a regular text field. This allows for selecting scraped values as well as custom values.

jQuery UI has some example code for creating a combobox. Because jQuery UI allows for downloading only certain components, the CSS and JS combined would be smaller than jQuery itself.

[justincy]

I have a branch with much of the work done, but the popup is too small for it. I think that we'll have to convert it back to a content script that shows a modal dialog in the middle of the page. I don't see any other way of getting enough room for the large comboboxes on each field.

[justincy]

Still plan on doing this after #8. Still need to get rid of the popup, but instead of the modal dialog we'll open a special built-in search page in a new tab.