Added pkgadd distribution for Solaris.

Added a cleaner way to install demo source so that installed versions use a
simplified makedefs/makerules.

Small fix to get osgText to compile with Solaris CC.  Constructor declared
with a non-const argument, but implemented with const argument.

Make/makerules

@@ -215,6 +215,8 @@ __link :
 	    $(LINK) $$LINK `basename $(LNDEST)`;\
 	 fi
 		
+__instfiles :
+	@echo $(INSTFILES)
 
 sinclude $(MAKEDEPEND)