Add point context stuff.
Modify stage ctor to take PointContext.
Don't use delegating contrustors.
Modify initialization sequence.
Don't use delegating constructors.
Rename Init() to Construct()
Replace public: initialize() with prepare().
Make BPF/LAS work with PointContext changes.
Fixes for gcc 4.6.
More pipeline work.
Merge branch 'point-context' of https://github.com/PDAL/PDAL into point-context
We now write LAS points through a pipeline.
Enable the LAS writer tests that pass.
Make selector filter work with point context.  Fix selector test.
Merge branch 'master' of https://github.com/PDAL/PDAL into point-context
Pipelines are no longer a stage.  Use PipelineManager.
More LAS writer tests work.
Modify reprojection filter for new infrastructure.
Remove template on applyScaling/removeScaling.
Have setField automatically transform data to proper type for dimension.
Add setFieldUnscaled to invoke removeScaling automatically.
Merge branch 'master' of https://github.com/PDAL/PDAL into point-context

Conflicts:
	include/pdal/filters/PCLBlock.hpp
	include/pdal/filters/Scaling.hpp
Merge branch 'master' of https://github.com/PDAL/PDAL into point-context
Fix setRawField for new PointBuffer behavior.