merge 01c84eb5ebc2314c3afbae66e6c7db01a85b2c74 into master make sure to writeBufferBegin, even if we're not writing any points, so we can write 0-point files
merge 01c84eb5ebc2314c3afbae66e6c7db01a85b2c74 into master make sure to writeBufferBegin, even if we're not writing any points, so we can write 0-point files

Conflicts:
	src/Writer.cpp

radiantbluetechnologies/PDAL,jwomeara/PDAL,radiantbluetechnologies/PDAL,DougFirErickson/PDAL,mtCarto/PDAL,boundlessgeo/PDAL,mpgerlek/PDAL-old,boundlessgeo/PDAL,mpgerlek/PDAL-old,mtCarto/PDAL,Sciumo/PDAL,DougFirErickson/PDAL,lucadelu/PDAL,DougFirErickson/PDAL,boundlessgeo/PDAL,verma/PDAL,verma/PDAL,mpgerlek/PDAL-old,verma/PDAL,verma/PDAL,jwomeara/PDAL,Sciumo/PDAL,lucadelu/PDAL,Sciumo/PDAL,lucadelu/PDAL,verma/PDAL,radiantbluetechnologies/PDAL,lucadelu/PDAL,verma/PDAL,mtCarto/PDAL,Sciumo/PDAL,jwomeara/PDAL,DougFirErickson/PDAL,jwomeara/PDAL,mtCarto/PDAL,radiantbluetechnologies/PDAL,mpgerlek/PDAL-old,verma/PDAL,boundlessgeo/PDAL