App::DuckPAN: do perl version checking.

This should make the required and recommended versions more visible to
the users who need to know.
Server: only show asset loading messages in verbose.
remove unneeded test
Merge pull request #142 from duckduckgo/zaahir/remove-test

remove unneeded test, causing problems when system has old Groff
Merge pull request #134 from duckduckgo/mwmiller/versioning

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