Parallel Exodus writer was not asking for pieces. Fixed.

Change-Id: I07b6148b2184941740f02106e4b8462af3a1a92e
vtkAlgorithm: fix a typo

Change-Id: Iebf73d293a65119d6ea2562ed43123f7dfa54ba2
FiltersPython: create a vtkPythonAlgorithm class

This class will use Python code to implement an algorithm.

Change-Id: I1d7ae97f423b7643602f7d3690b2216a553d7e9d
Merge topic 'parallel-exodus-fix' into master

beb1efea Parallel Exodus writer was not asking for pieces. Fixed.
Merge topic 'python-algorithm' into master

6691160f FiltersPython: create a vtkPythonAlgorithm class
e8ba24a5 vtkAlgorithm: fix a typo