fix drop/drag-ability of licked hierarchy objects
changes to qPCL: bug solved in MLSsmoothing with clouds with colors, now used OpenMP implementation when possible. Load and Save PCD files now can handle sensor positions. Added constructors to ccGBLsensor and ccsensor, now when cutting or cloning a cloud the sensor is copied along with the cloud. Fixed ccCustomObject type.
Merge pull request #143 from luca-penasa/qPCL_stuff_some_bugs

changes to qPCL: bug solved in MLSsmoothing with clouds with colors, now...
TODO list updated
TODO list updated
Potential bug fix: texture filename may not be read at the right place in mtl file
New method: Edit > Colors > Level (RGB histogram edition)
New option: 'Force 8-bit colors' for LAS files
Glitch fix: Shift & Scale dialog could become very large due to the initial theoretical range of spin boxes (is it a Qt5 issue only?)
Compilation with Qt5 on Windows: importing platform and imageformats plugins
ccGLUtils moved to qCC_gl_Window sub-project
ccGLWindow now only uses double-precision matrices for more accurate interactions (especially for the interactive transformation tool)
ccGLWindow now only uses double-precision matrices for more accurate interactions (especially for the interactive transformation tool) - missing file ;)
Fixing last (partial) commits!
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Compilation on Linux
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