Panl should parse highlighting information (Low Priority)

[synapticloop]

At the moment, when highlighting is enabled in the Panl server, it will pass the request through to Solr, and then return the results without any parsing.

On the front end implementation, the implementor must lookup keys and values in the JSON object - Panl should parse the returned highlighinting information and attach it to the correct place in the panl JSON documents.

[synapticloop]

Panl doesn't interact with the returned documents (it just passes the information straight back to the user). This is a nice to have feature which will help end implementors.

probable implemenation is to add a new key to the returned docs array.