nProgress is checked for NULL, so make sure it's initialized
Fix mem leaks
Merge pull request #31 from asmaloney/init_var

nProgress is checked for NULL, so make sure it's initialized
Merge pull request #32 from asmaloney/mem_leaks

Fix mem leaks (PLY)
Bug fix on qPCL/MLS tool (+ Luca's PCL patch is now optional)
'Shift on load' information is now preserved by several operations (points sampling, meshing, etc.)
Point pairs based registration can now be used with a single cloud (in which case reference points must be input manually)