Log Message:
Changes 0.6.4:
* Added the option -nx.
* Clarified the behavior of -nz and the relation between -nz and -o0.
* Added a filesystem check (resolving normalized paths, symlinks, etc.)
  to better detect when the output overwrites the input.
* Enabled automatic wildcard expansion (i.e. globbing) on Win64.
* Fixed a Unicode build issue on Windows.