DuckPAN: deal with incompatible versions of PCPF.

Either of the changes by itself should fix this, but why not both?

- Ask for version 0.8 of Parse::CPAN::Packages::Fast
- Wastefully send the filename to the parser

If the first one doesn't move them up, the second one will make it work
with the old interface.
Merge pull request #173 from duckduckgo/mwm/insanity

DuckPAN: deal with incompatible versions of PCPF.