Log Message:
Update to 0.13.0
  NIH_<subcommand>_OPTS variables were introduced. With their help one
  can configure EVERYTHING from config file.

  NIH_OPTS config variable was also introduced.

  nih mark:
    - new option -n was added.

  nih install:
    - Option -D doesn't remove temporary directory.
    - New options -v and -V were added.
    - NO_REQPROV_CHECK and NO_REQPROV_CHECK config variables were
      removed.  Use NIH_INSTALL_OPTS instead.

  nih uninstall:
    - does not need "nih refresh -b".
      Thanks to Andrey N. Oktyabrski for the report!

  Fixed:
    - Finding a correct dependency now works correctly if dependency
      is ambiguous.
    - Unicity problem in "nih install PKGNAME" was fixed.
    - Analysing file conflicts now works correctly with files
      containing a space character.
    - Fix in saving ~/.nih/installed_* files
    - Check for version emptyness in "fake packages" was added.