Halt the simulation of the overall population exceeds a certain threshold.
|activeSites||CoordinateSet||The set of sites that are candidates for being affected by this Process.|
|maxTargets||Integer||The maximum number of locations to be affected by each occurrence of this process. Setting maxTargets to -1 results in an unlimited number of targets.|
|period||Integer||Waiting period between occurrences of this process. period=0 means do only once.|
|start||Integer||Time at which to begin executing this process (specified in integration cycles).|
|threshold||Double||Maximum occupancy before halt is triggered.|