This function is called from within other XDCscript scripts and
performs the same operations as
main() except that,
rather than output the return value of
inst.run(), this value
is simply returned to the caller of
exec().
var params = new Main.Params;
// Instance config-params object
params.pathArg = String null;
// repositories to scan for packages
Since this method is used to support both command line tools and
other XDCscript scripts, it is important to avoid explicit
termination of the JVM via java.lang.System.exit(); doing so
precludes callers from handling failures.