#64 issue solved: Fix access from base.py to nethack _vardir

[GeremiaPompei]

#64 issue solved: Fix access from base.py to nethack _vardir.
I tested the modification on my local project.
Seem that before this modification the library wasn't able to run because there was an access to self.env._vardir instead of self.nethack._vardir.

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[samvelyan]

Thanks @GeremiaPompei for your contribution. However, this issue required more changes so I moved your commit to #66 which also includes additional changes.