Spec clean-up
    
    - BR:/R: perl(Carp)
    - BR: perl(base)
    - Use DESTDIR rather than PERL_INSTALL_ROOT
    - Use %{_fixperms} macro rather than our own chmod incantation
    - Don't need to remove empty directories from the buildroot
    - Don't use macros for commands
    - Make %files list more explicit
    - Fix typos in %description