Added a bunch of files synched with 0.8.42

include/osgDB/WriteFile

@@ -0,0 +1,41 @@
+#ifndef OSGDB_FILEUTILS
+#define OSGDB_FILEUTILS 1
+
+#include <osg/Image>
+#include <osg/Node>
+
+#include <osgDB/Export>
+
+#include <string>
+
+namespace osgDB {
+
+/** Write an osg::Object to file. 
+  * Return true on sucess,
+  * return false on failure.
+  * The osgDB::Registry is used to load the appropriate ReaderWriter plugin
+  * for the filename extension, and this plugin then handles the request
+  * to write the specified file.*/
+
+OSGDB_EXPORT extern bool writeObjectFile(const osg::Object& object, const std::string& filename);
+
+/** Write an osg::Image to file. 
+  * Return true on sucess,
+  * return false on failure.
+  * The osgDB::Registry is used to load the appropriate ReaderWriter plugin
+  * for the filename extension, and this plugin then handles the request
+  * to write the specified file.*/
+OSGDB_EXPORT extern bool writeImageFile(const osg::Image& image, const std::string& filename);
+
+/** Write an osg::Node to file. 
+  * Return true on sucess,
+  * return false on failure.
+  * The osgDB::Registry is used to load the appropriate ReaderWriter plugin
+  * for the filename extension, and this plugin then handles the request
+  * to write the specified file.*/
+OSGDB_EXPORT extern bool writeNodeFile(const osg::Node& node, const std::string& filename);
+
+
+};
+
+#endif