Fix: invalid deallocation of arrays used by VTK

Within pcl/visualization, the method SetArray() from the vtkDataArray is
called from several locations in the source code. If not specified, the
vtkDataArray uses free() to deallocate the given memory. But in most
cases (in pcl/visualization) the allocation of arrays is done by new[].
Therefore, VTK_DATA_ARRAY_DELETE was appended as fourth parameter of the
SetArray() method to force the use of delete[] instead.
Merge pull request #1023 from jgarstka/vtk_bugfix

Fix: invalid deallocation of arrays used by VTK
Add tcp_open_
Remove useless Eigen macro
Add missing const qualifiers
Update doc & formatting
Add grabSingleCloud
Move camera_ to public
Rework transformation functions
Add extrinsic calibration functions
Add image capture callback