fix gh-1540 and close gh-1541. Don't use rpath if the user didn't provided cuda.root.
Merge pull request #1554 from nouiz/fix-1540

fix gh-1540 and close gh-1541. Don't use rpath if the user didn't provid...
Update MPI test to work with python3
Merge pull request #1561 from lamblin/fix_mpi_python3

Update MPI test to work with python3
Merge pull request #1556 from nouiz/mixed2

Faster compilation and sparse stuff.
Add profiling detail for the MergeOptimizer
Fix comment.