Copied the grid.py minimisation module from the original multi_processor branch.
The command used was:
svn cp svn+ssh://bugman@.../svn/relax/branches/multi_processor/minimise/grid.py subdivide_grid.py
This module is now part of minfx, but the Grid_info class will be used by the multi-processor code to
subdivide the diffusion tensor grid search. The code needs much work!
