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closes #407
cache filter no longer needed in PCL kernel
Give KDIndex a const reference to its PointBuffer since it doesn't/shouldn't modify it.
Constify and tweak for readability.
Fix output from Schema::toPTree() to be valid JSON without duplicate keys.
Merge branch 'point-context' of https://github.com/PDAL/PDAL into point-context-schema

Conflicts:
	include/pdal/KDIndex.hpp
	src/Schema.cpp
	src/kernel/PCL.cpp