offer alternative if cxxabi.h is not available
use try_compile to see if we can demangle
Merge pull request #365 from chambbj/issues/335-cxxabi

offer alternative if cxxabi.h is not available
Add lround for windows.
Merge pull request #379 from PDAL/issues/378-lround

Add lround for windows.
Have InPlaceReprojection use PointBuffer.
Merge branch 'master' of https://github.com/PDAL/PDAL into point-context
Merge branch 'point-context' of https://github.com/PDAL/PDAL into point-context

Conflicts:
	include/pdal/PointBuffer.hpp
Merge branch 'point-context' of https://github.com/PDAL/PDAL into point-context