use release for multiversioned documentation current_version context

this strips hash off of version

Author: ndgrigorian

docs/doc_sources/conf.py.in

@@ -137,7 +137,7 @@ if generate_multiversion == "ON":
         html_context = dict()
     html_context["display_lower_left"] = True
     templates_path = ["_templates"]
-    html_context["current_version"] = version
+    html_context["current_version"] = release
     html_context["version"] = version
 
     # POPULATE LINKS TO OTHER VERSIONS