Bug#895531: Unable to import neuron in python3

[Matthias Klumpp]

i!
Interesting, this works here without problems (vanilla Debian installation):

```
$ python3
Python 3.6.5rc1 (default, Mar 14 2018, 10:54:23)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import neuron
NEURON -- VERSION 7.5 master (6b4c19f) 2017-09-25
Duke, Yale, and the BlueBrain Project -- Copyright 1984-2016
See http://neuron.yale.edu/neuron/credits

>>>
```

The "nrn" module is a built-in module. Do you have any bits of a
different NEURON installation floating around that might interfere
with the package? Could you run the Python interpreter in verbose mode
(python3 -v) and try to import the module again (and paste the
output)? That would help to determine what is different between the
attempts to load the module.

Cheers,
   Matthias

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