ENH: changed some cones to use S8R element as default
STY: == to is
STY: == to is
ENH: added function to calculate the transformation matrix
ENH: renamed calc_T to transf_matrix
BUG: importing deg2rad
STY: call to deg2rad already imported
DOC: improved description of the transformation matrix
ENH: added transformation matrix, allowing non-default coordinate systems to be used