LGPL license for tree_kinematics package

[bit-pirate]

The whole tree_kinematics package is licensed using the LPGL, which I think is not necessary. The only true LPGL file is the treeiksolverpos_online.cpp, since it was derived from the KDL's LGP-licensed KDL::TreeIkSolverPos_NR_JL class.
Hence, I suggest to change the licenses to modified BSD for all files, but the treeiksolverpos_online.cpp and also modifiy the manifest accordingly.
Do you agree with this?

Note: In the future I'd like to move this IK solver out of this package and back into KDL. In that way the package becomes completely clean of LGPL stuff.

[bit-pirate]

@adolfo-rt do you (PAL Robotics) agree with changing the lincensing to BSD for all files expect treeiksolverpos_online.hpp/.cpp?

[adolfo-rt]

I don't remember how the different files interact with one another, but if the BSD part uses the LGPL code in a way that is consistent with its terms, you can go for it. Please make sure that it is the case.