Disabled some features on Windows

Mostly so we can get things to pass in ROSE.
Re-enabled DLL import/export using SAWYER_EXPORT symbol.
Markup tests; replaced nroff with Perl POD; added checking

* Replaced MarkupRoff with MarkupPod.  The nroff formatter was
  overly complicated due to sensitivity of blank lines, and not
  supported on Windows.  The Perl POD format is not so sensitive
  and is more portable. (And it can generate nroff if necessary.)
Cleaned up GCC warnings for breaking strict aliasing
Fixes for Microsoft C++
Merge branch 'perlpod'
Removed dependencies on boost::filesystem::temp_directory_path

This function is not available in all versions of boost that we want
to support.