Add mod (and setmod) operators

tests/all.test

@@ -289,6 +289,14 @@ null
 null
 [2, 8, 10, 14]
 
+25 % 7
+null
+4
+
+49732 % 472
+null
+172
+
 1 + tonumber + ("10" | tonumber)
 4
 15
@@ -452,12 +460,17 @@ null
 {"foo": 42}
 {"foo": 43}
 
-.[] += 2, .[] *= 2, .[] -= 2, .[] /= 2
+.[] += 2, .[] *= 2, .[] -= 2, .[] /= 2, .[] %=2
 [1,3,5]
 [3,5,7]
 [2,6,10]
 [-1,1,3]
 [0.5, 1.5, 2.5]
+[1,1,1]
+
+[.[] % 7]
+[-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7]
+[0,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,0]
 
 .foo += .foo
 {"foo":2}