modules CVS repository.
* Added README.perl describing Ron Isaacson's Env::Modulecmd
perl module (Ron.Isaacson@morganstanley.com).
* Added further tests for modulefile "module use dir_path"
* Fixed bug of unloading a modulefile with a "module use dir_path"
for "module use", "module use --append", and "module unuse".
* Changed the global variable names (flags,current_module) to
(g_flags, g_current_module) to identify their ubiquity in the
module source.
