Fixed a few mini tests issues.

Added 'darwin' and 'Posix' as versions user can't set.
Fixed #80 .

tests/mini/arrays16.d

@@ -1,4 +1,4 @@
-module tangotests.arrays2;
+module mini.arrays16;
 
 void main()
 {

tests/mini/arrays17.d

@@ -1,4 +1,4 @@
-module tangotests.arrays3;
+module mini.arrays17;
 
 void main()
 {

tests/mini/arrays18.d

@@ -1,4 +1,4 @@
-module tangotests.arrays4;
+module mini.arrays18;
 
 struct Str { int a,b; }
 void main() {

tests/mini/arrays19.d

@@ -0,0 +1,9 @@
+module mini.arrays19;
+
+extern(C) int printf(char*, ...);
+
+void main()
+{
+  bool var = ([] is null);
+  assert(var);
+}

tests/mini/arrays20.d

@@ -0,0 +1,23 @@
+module mini.arrays20;
+
+int[] foo()
+{
+    return [2,4,6];
+}
+
+int[] bar()
+{
+    return [1,3,5];
+}
+
+void main()
+{
+    auto a = foo();
+    auto b = bar();
+    assert(b[0] == 1);
+    assert(a[0] == 2);
+    assert(b[1] == 3);
+    assert(a[1] == 4);
+    assert(b[2] == 5);
+    assert(a[2] == 6);
+}

tests/mini/complex5.d

@@ -0,0 +1,13 @@
+module complex5;
+
+void main()
+{
+    cfloat c = 3+2i;
+    foo(c);
+}
+
+void foo(cfloat c)
+{
+    assert(c.re > 2.9999  && c.re < 3.0001);
+    assert(c.im > 1.9999i && c.im < 2.0001);
+}