Changes

* Implement the plotting function in the software specific module. This should have identical arguments to the [http://www.nmr-relax.com/api/3.3/lib.plotting.api-module.html lib.plotting.api] function, but without the initial 'format' argument.

* Register the software specific function in the API by adding it to the software independent function in [http://www.nmr-relax.com/api/3.3/lib.plotting.api-module.html lib.plotting.api].