PATCH for GROMACS4.6 beta3

- the patch.sh and src/lib/Makefile are the same of those in the branch tmp-cmake

the CMAKE patch works different from the former gromacs patches:

- untar gromacs-4.6b3 (./gromacs-4.6/)
- in gromacs-4.6/ copy patch.sh and patch
- mkdir a build folder ./gromacs-4.6/gmx-plumed/
- in gmx-plumed/ run cmake ../ to configure gromacs
- make / make install as usual

there is a bug somewhere for which a "-l" is added before
Accelerate in "-framework Accelerate" thus resulting in a
compilation error.