Goto file mapping overrides/breaks the default

[JonnyRa]

gf normally goes to multiple types of files.

if I press gf on a path in a haskell file when I have the hdevtools plugin installed/running, instead of opening the file it complains about it not being a haskell import statement.

Please don't override the default mappings! Also please don't set one up on leader - maybe advertise those functions/suggest a mapping but don't map keys by default.

I only occasionally find hdevtools useful (Ack and tags do most of what I want but quicker) so it's annoying that it overrides something less niche.