fixed minor bugs; cleaned up tests

tests/collections/ttablesref2.nim

@@ -0,0 +1,20 @@
+discard """
+  output: '''true'''
+"""
+
+import tables
+
+proc TestHashIntInt() =
+  var tab = newTable[int,int]()
+  for i in 1..1_000_000:
+    tab[i] = i
+  for i in 1..1_000_000:
+    var x = tab[i]
+    if x != i : echo "not found ", i
+
+proc run1() =         # occupied Memory stays constant, but
+  for i in 1 .. 50:   # aborts at run: 44 on win32 with 3.2GB with out of memory
+    TestHashIntInt()
+
+run1()
+echo "true"