more diagnostics for investigating odd failing reports
make it clear that this directory does not exist
doc clarification
no need for this explicit prereq; it is autodetected
newer pluginbundle defaults to MakeMaker::Fallback + MBT
use ourselves when building ourselves
Print the numified version of $^V, for diagnostic help

e.g. see
http://cpantesters.org/cpan/report/5c8ff79f-6e70-1014-86e8-8333ec4105d1
remove superfluous entries