addPC Add a point cloud to globalICP object.
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  DESCRIPTION/NOTES
  * This method is a wrapper for the constructor method of the 'pointCloud'
    class. Thus, call 'help pointCloud.pointCloud' for the parameter 
    description.
  * The point cloud added with this method is automatically saved to a mat file.
    The path to this mat file is saved in the object property 'PC', i.e. obj.PC.
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  INPUT
  [...]
  Parameters from the constructor method of the 'pointCloud' class (see above).
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  EXAMPLES
  Call 'help globalICP.globalICP' for a minimal working example, which also 
  includes this method.
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  philipp.glira@gmail.com
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