Update ply_io.cpp

Reading a binary PLY file with faces and "vertex_indices" property crashes, if only a PointCloud is provided. Since the polygons_ member is set to 0 and untouched otherwise.

Worked in PCL 1.6, doesn't work right now with 1.7.1.

The ply2pcd sample program provided with PCL crashes as well.
Change all "%zu" in *.h *.hpp and *.cpp to "%lu".
Merge pull request #597 from yangyanli/fix_%zu

Change all "%zu" in *.h *.hpp and *.cpp to "%lu"

Fixes #588.
Fix "unused-parameter" warning in 'accumulators.hpp'
Fix some whitespace issues
Fixing 'cannot find -lnpps' error when compiling with CUDA 5.5
Merge pull request #600 from jworch/lnpps

Fixing 'cannot find -lnpps' error when compiling with CUDA 5.5
Move 'accumulators.hpp' out of the 'detail' folder
Add: tool to generate random clouds
Merge pull request #599 from chambbj/add-generate-tool

Add: tool to generate random clouds
Add: tool to filter out local maxima
Add: tutorial for progressive morphological filter
Merge pull request #598 from taketwo/remove-detail-folder

Fix a problem with installing 'accumulators.hpp' file
Fix: add missing line break and pcl namespace in error message
Fix: allow computation of normals for a subset of input_

This is a quick hack that allows computation of normals for the only provided
indices.
A cleaner solution is more than welcome but due to time constraints I will
commit this to fix the bug for now.
Fix issue #601

A segfault were raised when selection or triangle are not valid pointers.
Just test and skip them in that case.
Merge pull request #609 from nizar-sallem/fix_obj

Fix obj
Fix: bug when same detector is used for more than one input

When using same detector for more than one input (different clouds),
normals are not reset which causes false results or error if the clouds
sizes don't match.
Merge pull request #610 from nizar-sallem/fix_harris_3d

Fix: bug when same detector is used for more than one input
New: KLT Tracking