don't call the result files .out but .res as the Makefiles tend to try
* doc/examples/*: don't call the result files .out but .res as
the Makefiles tend to try generating binaries for .out targets...
Daniel
fix an error message added tree2 example from Lucas Brasilino Daniel
* xinclude.c: fix an error message
* doc/examples/*: added tree2 example from Lucas Brasilino
Daniel