Update Pod-Usage to CPAN version 1.62

  [DELTA]

1.62 (marekr)
Patches provided by rjbs - many thanks!
- These commits update Pod::Usage to only use Pod::Simple, so that any
  reliance on Pod::Parser is removed, making it easier to remove Pod::Parser
  from core.
- [PATCH 1/4] update Makefile: strict, INSTALLDIR, 5.6
- [PATCH 2/4] we will start to require perl 5.6 from here on out
- [PATCH 3/4] always use Pod::Text as default base class
- [PATCH 4/4] eliminate the branch in which Pod::Parser would be used
  This commit is intended entirely to free Pod::Usage from any reliance on
  Pod::Parser.
  * Usage.pm now defaults to using Pod::Text, rather than checking $] to pick.
  * $Pod::Select::MAX_HEADING_LEVEL is replaced with a local var
  * &Pod::Select::_compile_section_spec is copied into this module
    This isn't the most elegant fix, but it's a bit of a ball of mud. The code
    is written to let you alter @ISA at runtime to something that is derived
    either from Pod::Parser or Pod::Simple. This should probably be more
    explicitly limited to Pod::Simple in future releases.
- CPAN#84031: eliminate branches using Pod::Parser
  removed test suite dependencies on Pod::Parser

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