Improved libpython search. Now works inside a virtualenv, too.
Improved libpython search. Now works inside a virtualenv, too.

1. Use HINTS instead of PATHS (other than PATHS, HINTS are searched
   before the system defaults)
2. Searching the default paths, too. Required inside a virtualenv.

hmeine/vigra,dagophil/vigra,DaveRichmond-/vigra,stuarteberg/vigra,capturePointer/vigra,timoMa/vigra,hmeine/vigra,dstoe/vigra,hmeine/vigra,ThomasWalter/vigra,xiwei-zhang/vigra,stuarteberg/vigra,dagophil/vigra,mmuellner/vigra,hmeine/vigra,capturePointer/vigra,dagophil/vigra,xiwei-zhang/vigra,stuarteberg/vigra,psteinb/vigra,xiwei-zhang/vigra,funkey/vigra,mmuellner/vigra,stuarteberg/vigra,dagophil/vigra,DaveRichmond-/vigra,psteinb/vigra,dagophil/vigra,timoMa/vigra,ThomasWalter/vigra,xiwei-zhang/vigra,dagophil/vigra,dstoe/vigra,xiwei-zhang/vigra,capturePointer/vigra,kod3r/vigra,cha007/vigra,DaveRichmond-/vigra,capturePointer/vigra,ThomasWalter/vigra,funkey/vigra,ThomasWalter/vigra,dstoe/vigra,cha007/vigra,stuarteberg/vigra,cha007/vigra,ThomasWalter/vigra,dstoe/vigra,kod3r/vigra,timoMa/vigra,cha007/vigra,psteinb/vigra,capturePointer/vigra,DaveRichmond-/vigra,capturePointer/vigra,timoMa/vigra,timoMa/vigra,ThomasWalter/vigra,hmeine/vigra,mmuellner/vigra,dstoe/vigra,psteinb/vigra,funkey/vigra,kod3r/vigra,xiwei-zhang/vigra,funkey/vigra,kod3r/vigra,kod3r/vigra,cha007/vigra,dstoe/vigra,capturePointer/vigra,DaveRichmond-/vigra,mmuellner/vigra,timoMa/vigra,mmuellner/vigra,funkey/vigra,mmuellner/vigra,DaveRichmond-/vigra,cha007/vigra,stuarteberg/vigra,kod3r/vigra,psteinb/vigra,funkey/vigra,kod3r/vigra,cha007/vigra,DaveRichmond-/vigra,dstoe/vigra,funkey/vigra,dagophil/vigra,psteinb/vigra,hmeine/vigra,ThomasWalter/vigra,mmuellner/vigra,stuarteberg/vigra,xiwei-zhang/vigra,hmeine/vigra,psteinb/vigra,timoMa/vigra