symmetrised

s21bac	Degenerate symmetrised elliptic integral of 1st kind R_C(x,y)
s21bbc	Symmetrised elliptic integral of 1st kind R_F(x,y,z)
s21bcc	Symmetrised elliptic integral of 2nd kind R_D(x,y,z)
s21bdc	Symmetrised elliptic integral of 3rd kind R_J(x,y,z,r)