Add integer/money arithmetic from Darren King.

src/include/utils/cash.h

@@ -24,8 +24,22 @@ extern bool cash_ge(Cash *c1, Cash *c2);
 
 extern Cash *cash_pl(Cash *c1, Cash *c2);
 extern Cash *cash_mi(Cash *c1, Cash *c2);
-extern Cash *cash_mul(Cash *c, float8 *f);
-extern Cash *cash_div(Cash *c, float8 *f);
+
+extern Cash *cash_mul_flt8(Cash *c, float8 *f);
+extern Cash *cash_div_flt8(Cash *c, float8 *f);
+extern Cash *flt8_mul_cash(float8 *f, Cash *c);
+
+extern Cash *cash_mul_flt4(Cash *c, float4 *f);
+extern Cash *cash_div_flt4(Cash *c, float4 *f);
+extern Cash *flt4_mul_cash(float4 *f, Cash *c);
+
+extern Cash *cash_mul_int4(Cash *c, int4 i);
+extern Cash *cash_div_int4(Cash *c, int4 i);
+extern Cash *int4_mul_cash(int4 i, Cash *c);
+
+extern Cash *cash_mul_int2(Cash *c, int2 s);
+extern Cash *cash_div_int2(Cash *c, int2 s);
+extern Cash *int2_mul_cash(int2 s, Cash *c);
 
 extern Cash *cashlarger(Cash *c1, Cash *c2);
 extern Cash *cashsmaller(Cash *c1, Cash *c2);