More clean up for synch with 0.8.42

src/Demos/sgv/README

@@ -0,0 +1,26 @@
+Note: Using sgv with Peformer (for IRIX and Linux users only)
+=============================================================
+
+If you find problems with loading .pfb files its likely that its due to undefined
+symbols.  This isn't a problem with the OSG implementation, but alas the only
+current solution is to directly link you app with the Performer libraries. The 
+Makefile contains two library list.  In Makefile you'll see something like :
+
+    #note, use this library list when using the Performer osgPlugin.
+    #LIBS = ${PFLIBS} -losgGLUT -losgDB -losg -lGLU -lGL  -lm -lXmu  -lX11 -lXi
+
+    #note, standard library list. 
+    LIBS = -losgGLUT -losgDB -losg -lGLU -lGL  -lm -lXmu  -lX11 -lXi
+
+Simple comment in the LIBS line with PFLIBS and comment out the standard LIBS,
+then :
+
+    make clean
+    make
+
+Hopefully the Performer distribution will eventually work as a dynamic plugin 
+but until that day we're stuck with this 'hack'...
+
+
+Robert Osfield,
+March 20001.