Simulating the ANSTO Platypus instrument in McStas
- add polarising mirror; not specified reflectivities yet, so not yet operational
- add lambda0 and dlambda to parameter list
- can select between FOC and POL
- parameterise m-coatings for L/R on CG3
- made Platypus part of CG3
- validated geometry of CG3 + Platypus
- updated documentation
- updated source term`