Usage:
[filenameLAS_registered,XYZoffset] = XYZregistration(LASfilename,referencepcpath,node_xyz);

Intput:
LASfilename: filename to be used to write out the 'las' file
referencepcpath: File path of ground truth data
node_xyz: array with 3D coordinates of points to be registered


Outputs:
filenameLAS_registered:path of registered point cloud ('las' file)
XYZoffset: [xoffset,yoffset,zoffset] 3d vector with the absolute offsets with respect to the ground truth