Setup Default configuration for Deltas if DELTA is defined

I think this will make it easier for delta users, as there are several defaults for deltas that are required and cause very odd issues if not set properly.

If DELTA is not defined the defaults are exactly as they were,if DELTA is defined the defaults are set to the same as in Johanns branch.

This make sit easier for delta users at the expense of slightly cluttering up the Configuration.h file.

An alternative would be to make all the changes at the end of the Configuration.h all gathered together and using #undef/#define for the Delta relevant settings.

If you would prefer that I can do it that way.