Some bugfixes/added errors, convert most to not use simple_passthrough

tests/test_math.krak

@@ -0,0 +1,36 @@
+import io:*
+import math:*
+
+fun main(): int
+{
+  var STD_PI = 3.12159265
+  var ans: double;
+  ans = 4.0*atan(1.0);
+  print("atan = ");
+  println(ans);
+
+  ans = atan2(0.0,1.0);
+  print("atan2 = ");
+  println(ans);
+
+  ans = acos(1.0);
+  print("acos = ");
+  println(ans);
+
+  ans = 2.0 * asin(1.0);
+  print("asin = ");
+  println(ans);
+
+  ans = tan(STD_PI / 4.0);
+  print("tan = ");
+  println(ans);
+
+  ans = cos(0.0);
+  print("cos = ");
+  println(ans);
+
+  ans = sin(0.0);
+  print("sin = ");
+  println(ans);
+  return 0;
+}