3401 remove legacy module

The PR removed the following CLIs from the Slicer code base (see slicer issue [#3401](http://na-mic.org/Mantis/view.php?id=3401) and [this wiki page](http://wiki.slicer.org/slicerWiki/index.php/Documentation/Labs/DeprecatedModules)):
* AffineRegistration
* BSplineDeformableRegistration
* LinearRegistration
* RigidRegistration
* MRIBiasFieldCorrection
* MultiResolutionAffineRegistration
* OtsuThresholdImageFilter
* OtsuThresholdSegmentation

The code (and testing data) associated with each CLI modules has been added to a dedicated GitHub repository:
* https://github.com/Slicer/Slicer-AffineRegistration
* https://github.com/Slicer/Slicer-BSplineDeformableRegistration
* https://github.com/Slicer/Slicer-LinearRegistration
* https://github.com/Slicer/Slicer-RigidRegistration
* https://github.com/Slicer/Slicer-MRIBiasFieldCorrection
* https://github.com/Slicer/Slicer-MultiResolutionAffineRegistration
* https://github.com/Slicer/Slicer-OtsuThresholdImageFilter
* https://github.com/Slicer/Slicer-OtsuThresholdSegmentation

Note that the Slicer license and a README.md file has been automatically added to each repo to explain that the module has been deprecated and is not maintained.

For example: https://github.com/Slicer/Slicer-OtsuThresholdSegmentation#otsu-threshold-segmentation

For reference, the script that allows to automatically add the README file is https://gist.github.com/jcfr/367bd37e8d5b5c78b0d0

@pieper, @fedorov, @lassoan  Please let me know if one of this module should NOT be removed.

What is the status regarding the `FiducialRegistration` module ? Since we now have `LandmarkRegistration`, can we confirm it should also be removed ?