update license to BSD

[k-okada]

Since original gmapping source and ROS openslam_gmapping package has been updated to the BSD-3 license (https://github.com/ros-perception/openslam_gmapping/pull/29), I think we have no reason to use CC (by-nc-sa / Attribution, NonCommercial, ShareAlike) for slam_gmapping package.

package.xml says the author of this package is @gerkey and also each file header says these files are authored by @kevincwells, @laurent-george. Are you OK with changing license to BSD (or other)?

• https://github.com/ros-perception/slam_gmapping/blob/1.3.10/gmapping/src/main.cpp

  • Copyright : 2008, Willow Garage,
  • Author @gerkey,

• https://github.com/ros-perception/slam_gmapping/blob/1.3.10/gmapping/src/nodelet.cpp

  • Copyright: 2008, Willow Garage,
  • Author: @kevincwells (https://github.com/ros-perception/slam_gmapping/pull/41/files#diff-44e70923a6dbe4fd4aad5046849da6c9)

• https://github.com/ros-perception/slam_gmapping/blob/1.3.10/gmapping/src/replay.cpp

  • Copyright : 2015 Aldebaran Apache-2,
  • Author @laurent-george , (https://github.com/ros-perception/slam_gmapping/commit/f0b405cc6841c4133ee028acba5d6f01cf8af513#diff-63ab3c493147f387fbd8317dd4db964d)

• https://github.com/ros-perception/slam_gmapping/blob/1.3.10/gmapping/src/slam_gmapping.cpp

  • Copyright : 2008, Willow Garage
  • Author: @gerkey
  • Modified by : Charles DuHadway

• https://github.com/ros-perception/slam_gmapping/blob/1.3.10/gmapping/src/slam_gmapping.h

  • Copyright : 2008, Willow Garage
  • Author: @gerkey

[gerkey]

I'm OK with that change.

Strictly speaking Willow Garage, as copyright owner for the work I did at that time, should make the decision. But: (a) at this point it's not practical to get someone representing Willow Garage to comment; and (b) I'm confident that if we could ask Willow Garage for permission the answer would be an unambiguous yes. So I feel that this license change can be done in good faith.

[k-okada]

@gerkey Thank you for replay and comments. I will release BSD-version of gmapping to melodic.