[svn r131] Fixed #11

All associative array properties now work as they should.

Fixed problems with some cases of array.length and array.ptr.

Fixed some problems with array properties.

Fixed 'in' contracts.

test/aa6.d

@@ -0,0 +1,25 @@
+module aa6;
+
+void main()
+{
+    int[int] aa;
+    aa = [1:1, 2:4, 3:9, 4:16];
+    printf("---\n");
+    foreach(int k, int v; aa)
+        printf("aa[%d] = %d\n", k, v);
+    aa.rehash;
+    printf("---\n");
+    foreach(int k, int v; aa)
+        printf("aa[%d] = %d\n", k, v);
+    size_t n = aa.length;
+    assert(n == 4);
+    int[] keys = aa.keys;
+    assert(keys[] == [1,2,3,4][]);
+    int[] vals = aa.values;
+    assert(vals[] == [1,4,9,16][]);
+    aa.remove(3);
+    printf("---\n");
+    foreach(int k, int v; aa)
+        printf("aa[%d] = %d\n", k, v);
+    assert(aa.length == 3);
+}