Indirect Addressing for Unary Operations with a Constant

For unary operations with a constant rhs the list is even shorter. For example, for setting a staggered fermion vector to zero the variants are as follows.

	function name	meaning
1	QLA_V_eq_zero(c)	c = 0
2	QLA_V_veq_V(c,n)	c[i] = 0
3	QLA_V_xeq_V(c,j,n)	c[j[i]] = 0