DS-1689 Spatial Indexing and Querying

This request implements the following:

1. Introduces a new input-type "location" for submitting an item's bounding box using a map.
An example is commented at input-forms.xml

2. Enables Spatial Indexing and quering in Lucene. The user has to specify the spatial metadata field in config.cfg following by ":location" flag

3. Enables Spatial Indexing and quering in Solr. For that reason a new spatial field Type was added in solr schema. The user has to specify the spatial metadata field in discovery.xml. 

Also, there is an implementation in XMLUI for mirage theme.

For making visible the map it needs to export OpenLayers 2.12 API (http://openlayers.org/download/) in xmlui/static/js folder and comment out "display:none" command in style.css at line 1405.

Also jts-1.8.jar must be present at lib folders 
Shouldn't this be configurable as well?