Fix #17 - Build static libhadoofus.a with symbols hidden
Fix #17 - Link pyhadoofus to libhadoofus statically by default; dynamic as option

          Unstripped:  Stripped:
Dynamic:  1.5 MB       300 kB
Static:   1.8 MB       350 kB

So the bulk of the code and symbols is Cython, and static linking costs
50 kB stripped or 300 kB unstripped.