SPHM1RT now works in 1D and 2D propagation tests
Add the propagation part of the SPHM1-RT in rt/SPHM1RT
The examples are in examples/RadiativeTransferTests/SPHM1RTtest/
Performance of Advection_1D
Performance of Advection_2D
Formatted with format.sh and format_python.sh
All unit tests pass
@mivkov : I have modified all of the rt_first_init_part to include rt_props.