Drop tests subpackage and clean up
    
    - Drop -tests subpackage (general lack of interest in this), but include
      them as documentation for the main package
    - Drop redundant BR: perl(ExtUtils::MakeMaker)
    - Drop redundant unversioned explicit requires
    - Drop %defattr, redundant since rpm 4.4
    - Make %files list more explicit
    - Don't use macros for commands
    - Run the author tests in %check
    - BR: perl(Test::Pod) and perl(Test::Pod::Coverage)
    - Use tabs