start of tests refactoring; sqlite3 new wrapper fixes

tests/accept/run/tmultim1.nim

@@ -0,0 +1,23 @@
+# Test multi methods
+
+type
+  TExpr = object
+  TLiteral = object of TExpr
+    x: int
+  TPlusExpr = object of TExpr
+    a, b: ref TExpr
+    
+method eval(e: ref TExpr): int = quit "to override!"
+method eval(e: ref TLiteral): int = return e.x
+method eval(e: ref TPlusExpr): int = return eval(e.a) + eval(e.b)
+
+proc newLit(x: int): ref TLiteral =
+  new(result)
+  result.x = x
+  
+proc newPlus(a, b: ref TExpr): ref TPlusExpr =
+  new(result)
+  result.a = a
+  result.b = b
+
+echo eval(newPlus(newPlus(newLit(1), newLit(2)), newLit(4))) #OUT 7