Adjusted url hash format from urlname&urlname.. to urlname[=color]&urlname..., where the [=colour] is optional.
Updated methods for adding/removing kmls to reflect this - i.e. to add/remove the kml's colour from the hash as well, and to allow the set up from url to set colour.
Also redid method for removing urlnames from hash to ensure correct behaviour in the (so far not possible - I think) case that one urlname forms part of another one.
Fixed bug where the kmls generated by the permalink would fail to load.