report in python, a first version

[Sébastien de Menten]

Hello,

I have finished a first version of a mechanism to use python for reporting
in gnucash.
It uses a scheme script to start a python process that does the heavy
lifthing.

Should you be interested, you can find documentation/instructions here:
http://gnucash-utilities.readthedocs.io/en/master/doc/doc.html#report-creation-linux-and-windows-python-3-5
as well as an example of the simplest report possible
http://gnucash-utilities.readthedocs.io/en/master/doc/doc.html#a-simple-report

Any feedback appreciated.

Sebastien