add updated version of Perl
fix BioPerl patch
remove unneeded BioPerl patch
remove incompatible Bio::Perl extension
add missing Test::Warnings as dep for DateTime
add File::Copy::Recursive dep for Module::Build::XSUtil
fix typo
add Cwd::Guard dep for Module::Build::XSUtil
fix typo
fix another typo
add Test::LeakTrace dep for Mouse
remove DB_File extension, since it requires DB as a dependency
Merge pull request #909 from boegel/new_perl

add easyconfigs for Perl v5.20.2 + updated extensions