Add the gaHighlightFeaturePermalinkManager service

This commit adds a gaHighlightFeaturePermalinkManager services that adds "recenter" layers and recenters the map to the features specified in the URL.
Remove "highlight feature" code from map directive
Activate feature highlight permalink manager
Fix indent
gaHighlightFeature service refactoring
Do not use ol.extent.createEmpty
Do not add the same BOD layer multiple times
Handle case of multiple <bodid>=<fids> pairs in URL
Merge pull request #628 from geoadmin/fix_highlight

layersconfig?lang=undefined requests are back