Octomap-py

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- BBX iterators fixed for empty trees (point3d version)
- Removed qglviewer.h from some public octovis headers
- Fixed QGLViewer library names for Ubuntu wily and xenial
- Fixed install path in CMakeConfigs

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- Fixed 82: Enable uninstall target for complete project
- Fixed 47: Exported CMake library paths for Windows no longer
have the Release/Debug prefix and correctly contain the .lib file
- Fixed 51: IO factory class registry with MSVC. Calling a dummy
function from an OcTree class c'tor enables reading general .ot files
when compiling with MSVC
- Fixed 100: Explicit casts to avoid warnings with MSVC

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- BBX iterators fixed for empty trees (thx to F. Boniardi)
- graph2tree tool option for nodes in global frame
- New octree2pointcloud PCL conversion tool (thx to F. Ferri)
- Improved change detection / diff calculation (thx to C. Brew)
- getUnknownLeafCenters now allows queries at a specified depth (thx to
A. Ecins)
- Fixed hashing overflow with clang (thx to L. Riano)

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- Maintenance release for ROS:
Added function to determine state of change detection

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- FSF address in octovis license header for OctoMap package in Fedora
- Separate build options for octovis and dynamicEDT3D. Thanks to C. Reist!

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- Support for SOVERSION in the libraries for better packaging
- Warning for unknown space in castRay() removed (needs to be inferred by
calling code depending on return value and endpoint voxel)
- Marching cubes for ray surface intersection extended
- Fixed QGLViewer include paths
- ScanGraph read error no longer exits the process