Added sol 932 and sine discretisation for dynamic loads:

Sol 932: 
This is equivalent to 912 but allows the use of Static Loads (for case 912 the static loads are set to zero when passed to xbeam_solv_couplednlndyn ). The change affected all the Fortran files in this delivery and was minimal. 

Python wrapper:
- fixed torque force regulator (cost/constr modules)
- input.load.fourier module added to provide a new method to input dynamic loads. Only sine series are implemented. 
- xbcomponent updated to use new solution and method for dynamic forces.