Add 'safeSave' for safe saving over previous file while making sure that one copy is always complete.
Add 'safeSave' for safe saving over previous file while making sure that one copy is
always complete.

SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat