[pdal] PDAL Python3 issues

[Howard Butler]

> On Jan 23, 2017, at 12:19 PM, Howard Butler <howard at hobu.co> wrote:
> 
> 
>> On Jan 23, 2017, at 11:53 AM, Sebastiaan Couwenberg <sebastic at xs4all.nl> wrote:
>> 
>> If python-pdal can only work with the same Python version as
>> libpdal-plang was built with, we'll need to drop the python3-pdal
>> package or add a libpdal-plang3 for it.
> 
> This is a true statement. plang and PDAL Python extension should not use mixed Python runtimes. There is a check in setup.py that attempts to prevent it.

Followup ticket by Bas https://github.com/PDAL/PDAL/issues/1478