Add: tool to filter out local maxima
Add: tutorial for progressive morphological filter
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
fixes #578, SHOTEstimationBase needs to be exported for app feature_matching
Merge pull request #611 from fran6co/fix-features

SHOTEstimationBase needs to be exported for app feature_matching, fixes #578
Refine documentation for `PCLVisualizer::addArrow()` functions
fixes #124, mac os x linker needs to explicity set dynamic_lookup for plugins
simplify the GridMinimum interface
Merge pull request #608 from chambbj/simplify-grid-minimum

simplify the GridMinimum interface
Merge pull request #604 from chambbj/add-local-max-tool

Add: tool to filter out local maxima
Add: tool to find grid minimums
Merge pull request #603 from chambbj/add-grid-min-tool

Add: tool to find grid minimums
Remove "global" from all calls to `addCoordinateSystem`

This makes the tutorial compatible with both PCL <= 1.7.1 and the
current master.

See the discussion on dev list: http://www.pcl-developers.org/pcl-visualizer-demo-cpp-compilation-error-and-solution-td5709431.html
Merge pull request #594 from nizar-sallem/fix_normal_estimation

Fix: computation of normals for a subset of input_