Overidable class or proximity search
Added proximity search when the parameters have been set
Added proximity search form for location listin pages
New methods: getUnit() works out which units the locations plugin is using (km/miles)
Search form form proximity search
Added proximity search form
Added proximity search parameters into pager url
Added proximity search into map points
Added proximity search into display map
Now supports both miles and kilometers as distance units
Support for miles and kilometers in proximity search
Added method to convert Miles to Kilometers