Implement interaction with PointCloud class through Python

[WorkGitAccount]

References #13

The cyPointCloud class represents a cloud of points.

• Verify PointCloud class binding and linking with python
• Write example code that demonstrates a working PointCloud class
• Write and verify unit tests including tests for each function:
  - constructor()
  - BuildKDTree()
  - getPoints()
  - getClosest()

[WorkGitAccount]

The most basic test demo doesn't strictly need to interact with PointCloud class as calling PcCoarsen constructor should be enough. However binding to PointCloud should be easier to implement before PcCoarsen that has matlab references to change.

Built some test code and walked through C+=. Building a shared library is setup slightly differently for this test code than for the basic implementation of PcCoarsen.

[t:110]

[WorkGitAccount]

Not needed to run the demo.