reworked bindings, ongoing work

    * ported/reworked more of TskFsFile, TskFsName, TskFsDir, TskFsMeta
    * added build script and diagnostic script
    * added code to generate MANIFEST file required for Perl
      distribution packaging
    * added check-symbols.pl script to check for available symbols
      (in particular the symbols that come from the XS bindings)
    * added build.sh script to build for development purposes
    * ported more types to typemap, flags/constants to Tsk module
    * added more tests
    * started porting TskVsPartInfo
    * updated porting-plan.md
    * ported tsk example to Perl
    * preparing for CPAN release. added minimal POD for CPAN release.
    * CPAN release completed. Tsk Perl bindings 0.02 are available on CPAN.