Changes

To add a new plotting feature for , the following steps are required: * For a new software type, a new module in [http://www.nmr-relax.com/api/3.3/lib.plotting-module.html lib.plotting] must be created.* For a new graph type, a new function should be added to the [http://www.nmr-relax.com/api/3.3/lib.plotting.api-module.html lib.plotting.api module]. The first function argument should be 'format'.* Implement the plotting function in the software specific module.* 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].