fix for MSVC build (OpenMP parallelized for-loop does not accept size_t variable)
Fix ununsed parameters warnings
Fix deprecated functions warnings
Merge pull request #755 from VictorLamoine/master

Warning fixes
Fix typo: broken link in Qt tutorial
Merge pull request #759 from VictorLamoine/master

Fix typo: broken link in Qt tutorial
Fix #667: Imrpove PCL visualizer help
Merge pull request #761 from VictorLamoine/master

Fix #667: Imrpove PCL visualizer help
Prevent undefined behaviour when drawing axis
Removement of an obsolete OpenCV dependency
Merge pull request #763 from mdkus/master

Removement of an obsolete OpenCV dependency
Merge pull request #762 from VictorLamoine/master

Prevent undefined behaviour when drawing axis
Merge pull request #753 from magro11/master

fix for MSVC build
Use Qt4 by default instead of Qt5

Earlier version of VTK does not support Qt5 and PCL will not compile
correctly when Qt5 is used by default.
From VTK wiki (http://www.vtk.org/Wiki/VTK/Configure_and_Build):
```
Building VTK with Qt is a common use case for the creation of nice
user interfaces. Using Qt 4.8.* is recommended, but earlier versions
and Qt 5.* are in various stages of support.
...
Qt5.*
Warning: This has only been tested on Qt5.2.1, and only on a few systems.
```
Add Glasbey color mapping mode in PointCloudImageExtractorFromLabelField

The Glasbey lookup table (LUT) is a color table structured in a
maximally discontinuous manner. That is, adjacent color bins are chosen
to be as distinct from one another as possible.
Update pcl_pcd2png tool to support Glasbey color mode
Add a protected virtual method extractImpl() in image extractors
Add a missing template specialization for isFinite<Intensity>()
Add a option to paint infinte points with black
Update pcl_pcd2png tool to support painting infinite points with black