maint: preparation for release with Dist::Zilla

* remove feedback section wich is generated automatically by BioPerl pluginbundle
* remove trailing whitespace to keep the Dist::Zilla::Plugin::EOLTests happy
maint: preparation for release with Dist::Zilla

* replace =head2 with method, attr or internal (using Pod Weaver)
* remove unnecessary APPENDIX POD section
* remove Version and revision POD sections which are now generated automatically