2.0 compatibility
Convenience scripts for switching Vienna versions.
Revert "Convenience scripts for switching Vienna versions."

This reverts commit fe3b38b74d20ec4455e29470c0b6c4446b8e458f.
Version specific Makefile
Removing commented stuff.
Makefile merge resolution.
Make 2.1.2 branch look like fftbor2d
Implicit matrix size optimization.
Better documentation on where the energy functions are from.