[Debian-med-packaging] python3 PR for pdb2pqr

[Drew Parsons]

Hi Andreas, I was looking in on the python 3 status of pdb2pqr, and saw 
you've been making some python3 patches.

I saw also there's an upstream PR addressing python3 support, 
https://github.com/Electrostatics/apbs-pdb2pqr/pull/516

Some of their patching is already in your patch but I'm not sure if it's 
wholly the same.  So I thought to ask if this PR#516 is useful for you 
to get pdb2pqr back into testing.

The pH-dependent H+ charging feature of pdb2pqr is what brought it to my 
attention, I mean to look closer how they're doing that.

Drew