Smart suggest using search

[edsu]

Implement "smart suggest" using the Solr select endpoint rather than suggest in order to get the document IDs for the title results, so they can be directly linked to.

When the user types in a string a search for the string with * appended of dct_title_ti and dct_spatial_tmi is performed. The results are stored in an instance of the new Suggestions class which has methods to return locations, datasets and maps. Each of the suggestions is an instance of Suggestion which can highlight the query.

TODO: the Suggester, Suggestions and Suggestion classes need unit tests. I tested with 4k documents and it seemed to perform similarly to the suggest endpoint, but it will be useful to see how it performs with more.

Closes #1047