Initial coding of <include> tag. Hass issues.

__include.cpp

@@ -0,0 +1,17 @@
+#include "__include.h"
+#include "Exception.h"
+#include "File.h"
+
+namespace jet {
+   
+   __include::__include(coreutils::ZString &in, coreutils::MString &out, Global &global) : Tag(in, out, global) {
+      if(!variableDefined("file"))
+	throw coreutils::Exception("file keyword must be specified.");
+      if(hasContainer)
+	throw coreutils::Exception("include tag should not have a container.");
+      coreutils::File file(file);
+      container = file.asZString();
+      processContainer(container);
+   }
+
+}