Remove updateOrCreateFromFields and it's uses
All uses of updateOrCreateFromFields were replaced with
updateOrCreateFromKeyname. This way the logic API is not as cluttered
with a bunch of helper methods.
Patch by: Sverre Rabbelier
Coverage: code coverage testing for Python
Coverage.py is a Python module that measures code coverage during test execution.
It uses the code analysis tools and tracing hooks provided in the Python standard
library to determine which lines are executable, and which have been executed.
For more information, see http://nedbatchelder.com/code/modules/coverage.html