Move and group theano.configdefaults variable definitions into functions

This makes them easier to refactor and easier to invoke from elsewhere.

Move and group theano.configdefaults variable definitions into functions
9cb14643 · Michael Osthege · Brandon T. Willard · 7acf2a73 · 9cb14643
--- a/theano/configdefaults.py
+++ b/theano/configdefaults.py