Rewrote location_set.of_pairs().

Rewrote location_set.of_pairs() to support coordinate pair inputs in the form of "x= y=" as well as still supproting "[1]: [2]:". Also, if there is any additional data stored as either a [3] index or as extra variables in the associative table form, then that extra data will be stored as the data in the key/data pair of the location_set, instead of simply storing "true".

Also changed the healer support mai to use the new of_pairs() method to create the avoid_map.