Add support for multihop travel at higher awareness levels

[djgroen]

Idea is to use a movestring array of location IDs (or names), and to have agents skip route choice decisions while this array is non-zero. An element is removed from the array whenever a location is visited.

The array will be erased whenever a location in the movestring can no longer be chosen for any reason.

This feature should be triggered automatically when awareness level is higher than 1.

[djgroen]

This is also now present in the code :)