Introduce Robust PCA.

Add the support of Robust PCA computation in vtkPCAStatistics.
This is performed by computing median instead of mean in the
vtkMultiCorrelativeStatistics class (done when turning
on the MedianAbsoluteVariance flag). Support is also done
in the parallel version of the algorithms.
Add 2 tests for this new robust implementation.

Change-Id: If91813722c7528b96e6594a3b6e21ebcf3e6b455
Merge topic 'update_vtk' into pv-master

9c36c35 Merge remote-tracking branch 'pvvtk/pv-master' into HEAD
4f83c77 Merge topic 'mathtext-baseline' into master
471c119 Merge topic 'fix_visibility_for_static_targets' into master
6f3b654 Update baseline
9a0fbb8 Merge topic 'ugridbase-support' into master
e9f66ba Tie vtkUnstructuredGridBase into the dataset type system.
1908a35 Merge topic 'pvweb-fix-selection' into master
ab78408 Increment version to VTK 6.2.0
2e8ba2b Need to check for static targets before adding abi visibility flags.
36ad281 Merge topic 'fix_buffer_overflow' into master
37615d2 BUG: Fix buffer overflow in vtkPUnstructuredGridConnectivity
a00ef38 Merge topic '0013597-fix-sys-hdf5' into master
b60586f Merge remote-tracking branch 'pvvtk/pv-master' into HEAD
e79f3a3 Merge topic 'fix_composite_data_names' into master
af508c8 Fix send/receive for composite datasets.
84c0666 Preserve composite-data names in legacy readers/writers.
...
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: I7260430df1f25015d6c4a917b3ebcf400685473a
Merge topic 'IntroduceRobustPCA' into master

5a31f33a Introduce Robust PCA.