comments and cleanings
enhance unit tests

- ensure that we don't test another OSL that may be on the path
- added unit tests
new feature : print stacktrace, enabled in error output in debug mode
new "realpath" primitive
Enhance file handling
enhance a style and some output functions
fix(OSL_EXIT_abort_execution_if_bad_retcode): the first arg (return value) is no longer displayed
new OSL_FILE funcs
bump version