loadPC Load point cloud to workspace.
  ------------------------------------------------------------------------------
  DESCRIPTION/NOTES
  With this method a point cloud which was previously added to the globalICP
  object, can be loaded to the workspace.
  ------------------------------------------------------------------------------
  INPUT
  [i]
  Index of point cloud to load.
  ------------------------------------------------------------------------------
  EXAMPLES
  Call 'help globalICP.globalICP' for a minimal working example, which also 
  includes this method.
  ------------------------------------------------------------------------------
  philipp.glira@gmail.com
  ------------------------------------------------------------------------------