molsysmt.MolSys.info() and molsysmt.MolSys.get() should be shortcuts

Now, molsysmt.MolSys.info() is calling molsysmt.basic.info(). But the method should be straightforward... skipping basic.info().

We should write an info method for each form if possible. And in case there is no specific form-info method, the library should work with basic.info().