Modified behavior of crt2sph to allow complex cartesian components. Added a function dc_hrz2vrt() to compute vertical component (which can be complex) of horizontal direction cosines .
Modified behavior of crt2sph to allow complex cartesian components.
Added a function dc_hrz2vrt() to compute vertical component (which
can be complex) of horizontal direction cosines .

2baOrNot2ba/dreamBeam,2baOrNot2ba/dreamBeam