Python3 functional

Dear Maurice,

I've contacted you last week with respect to your dose environment, and had communicated with you that I would like to work under Python3, if possible. My 'regular' name is Douwe van der Veen, but I have a GitHub account lingering under 'appultaart' from a while ago.

Note that I am no proficient Git user (I do not code much, and if I do it's without using repositories/collaboration tools), so please be patient with me and my mistakes.

I have forked your latest branch that includes some of the 2to3 changes, and have created from 'master' a branch 'Python3_functional'. All changes made in that branch have had as net end result that I can run all the examples in the Examples folder under both Python 3.4.2, and 2.7.8.

I have tried to comment the commits so you can follow my rationale for the changes. As said, I have no computer science background and consider my programming skills at basic amateur level at best -- I am grateful for any mistakes that you might encounter in the changes.

Let me know if I am doing anything against the mores of your code base, or of GitHub -- I'm ignorant in many things in this for me new territory!

Best regards,
-douwe