laserscan2costmap occupancy grid map orientation not right

[zhengzh]

Laser scan doesn't align with ring map, the laser should rotate clockwise pi/2 to align with the map.
it seems that following line in laserscan2costmap.cpp is wrong,

static double laser_offset = fabs(scan.angle_min);

should be

static double laser_offset = scan.angle_min + 2 * M_PI;

[gbiggs]

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