Log Message:
Changes 1.21:
* Various patches by Chorny at cpan dot org and fREW frioux at gmail dot com:
* Windows NTFS compatibility fixes.
* Allow PID to be negative.
* Lexically scope temp file handles to reduce changes of memory leak and
  avoid unintentional glob clobberation.
* Security fix: 3 arg open().
* Repair test suites logics.
* Fixed infinite freezing on Strawberry Perl v5.10.0.
* Fixed infinite freezing on ActiveState Perl v5.12.1.
* Sorry for the past 8 years of suffering.