Add a Back button to the single location page

[wpsmort]

Requested by Ivan by email.

Ivan would like a Back button on the single location page that takes you back to the search results. We'd need to maintain the search criteria entered and the results.

[arnaudbroes]

Could easily done by POST'ing back to the previous page. Probably will only work when they click the button - not sure we can do the same thing if the navigate back another way.