updated declaration of rover_positions
updated declaration of rover_positions

from QPoint to QPointF to correct an issue where rover placement
was always consistently rounded to integer meter positions.

The robot placement should now be adjustable to any floating point
placement.

BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS