Have libnabo, pointmatcher, yaml, build shared libraries
Remove archive files from being installed
Rm apparently not needed
Make pointmatcher compile a shared library appropriately
buildy.py: 'verify' now tests if it can actually execute cmd

This detects the problem where g++ doesn't exist on the system.
Drop support of subdirs behind lib. Fixes improper libgcc_s rpathing.
make-dist.py: Only ship libgomp if Linux

OSX only has an archive.