Added Paging TerraPage loader and osgTXP library.

src/osgPlugins/txp/trpage_util.cpp

@@ -0,0 +1,27 @@
+/* ************************
+   Copyright Terrain Experts Inc.
+   Terrain Experts Inc (TERREX) reserves all rights to this source code
+   unless otherwise specified in writing by the President of TERREX.
+   This copyright may be updated in the future, in which case that version
+   supercedes this one.
+   -------------------
+   Terrex Experts Inc.
+   4400 East Broadway #314
+   Tucson, AZ  85711
+   info@terrex.com
+   Tel: (520) 323-7990
+   ************************
+   */
+
+#include <osgTXP/trpage_util.h>
+
+/* trpage_util.cpp
+	This source file implements various utility routines for paging archive
+	*/
+
+/*  The merge routine used to be in here.
+    However, merge isn't actually general enough to be part of the library.
+    Only portable code should be in the TerraPage API.
+    Instead, there's a Windows specific program that merges TerraPage archives in
+    the merge/ directory of this distribution.
+ */