1.2.41 `sm1.ecartd_gb'
----------------------

sm1.ecartd_gb(A)
     :  It returns a standard basis of A by using  a tangent cone
     algorithm. h[0,1](D)-homogenization is used.   If the option
     rv="dp" (return_value="dp") is given,  the answer is returned in
     distributed polynomials.
Example:

      input1
        F=[2*(1-x-y)*dx+1,2*(1-x-y)*dy+1]$
        FF=[F,"x,y",[[dx,1,dy,1],[x,-1,y,-1]]]$
        sm1.ecartd_gb(FF);
      output1
        [[(-2*x-2*y+2)*dx+h,(-2*x-2*y+2)*dy+h],[(-2*x-2*y+2)*dx,(-2*x-2*y+2)*dy]]
      input2
        F=[2*(1-x-y)*dx+h,2*(1-x-y)*dy+h]$
        FF=[F,"x,y",[[dx,1,dy,1],[x,-1,y,-1,dx,1,dy,1]],["noAutoHomogenize",1]]$
        sm1.ecartd_gb(FF);

