Put utils in their own folder. Increases organization, and everything will be available under SimPEG.utils

NOTE: if you add a new function (or file), you must register it in __init__.py for it to be available under:

e.g.
...
from utils import mkvc, …
...
from MYNEWFILE import MYNEWFUNCTION

SimPEG/tests/test_operators.py

@@ -1,7 +1,5 @@
 import numpy as np
 import unittest
-import sys
-sys.path.append('../')
 from OrderTest import OrderTest
 
 MESHTYPES = ['uniformTensorMesh', 'uniformLOM', 'rotateLOM']