Update Pod-Usage to CPAN version 1.67

Update Pod-Usage to CPAN version 1.67

  [DELTA]

1.67 (marekr)
- added options -perlcmd and -perldoc to allow for non-standard installations
  of perl and the perldoc script. Thanks to Markus Jansen for the patch

1.66 (marekr)
- CPAN#102116: pod2usage() -sections omits section with subsection specified
    added more precise documentation about the -section syntax and semantics
- CPAN#102117: pod2usage() changes formatting
    added documentation to describe what formatting changes pod2usage applies
- CPAN#102101: New tests fail when in core
    changed the way the tests find their dependencies. Thanks to BINGOS for
    the patch, applied in slightly modified way

1.65 (marekr)
- CPAN#81059: [RT #115534]: Pod::Usage Failes to Select -sections with Negation
    fixed a specific corner case for section selection
- CPAN#101538: Pod::Usage doesn't handle E<copy> correctly
    introduced a utf8 option; this may actually not solve the problem, but
    it is the best we can do for the moment
- CPAN#101581: pod2usage() -sections omits marked-up text from =head lines
    make sure that marked-up text is not skipped