**IMPORTANT** : `coord.in` files need to be updated! _All_ coordinate types now require the two scaling coefficients.  Put them there regardless of coordinate you are defining.
With this change, the format is the same for all coordinate definitions and you do not have to check if coefficients are expected for a specific type.
* Plain bond distance and bond angle coordinates are not shifted by coefficient 2 and then scaled by coefficient 1.   Old definitions would be equivalent
to defining with

    1.000     0.000

* Added new rij scaling type (tanh) that can be used as a smooth step function.