Added support for the D programming languge.

It is still a bit rough around some edges, particularly with regard to multi-threading and operator overloading, and there are some documentation bits missing, but it should be fine for basic use.

The test-suite should build and run fine with the current versions of DMD, LDC and Tango (at least) on Linux x86_64 and Mac OS X 10.6.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@12299 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/d/pointer_reference_runme.2.d

@@ -0,0 +1,14 @@
+module pointer_reference_runme;
+
+import std.exception;
+import pointer_reference.pointer_reference;
+import pointer_reference.Struct;
+
+void main() {
+  Struct s = get();
+  enforce(s.value == 10, "get test failed");
+
+  auto ss = new Struct(20);
+  set(ss);
+  enforce(Struct.instance.value == 20, "set test failed");
+}