Import and link landmarks, landmark groups and locations.

Import and link landmarks, landmark groups and locations.

The passed in <data> parameter is a list of two-element lists, each representing a group along with its linked landmark and locations. The group is represented by its name and the members are a list of four-element lists, containing the landmark name and the location. This results in the following format:

[[group_1_name, [[landmark_1_name, x, y, z], [landmark_2_name, x, y, z]]], ...]

Note that this parameter has to be transmitted as a JSON encoded string.