Added DynaFields to the dynaform module
DynaFields work similar to DynaForms, in that they allow a regular
field to be created by supplying a dictionary.
The main advantage is that any property can be added, even if the
base class doesn't have support for it.
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