Added SA turbulence model for CPU
Merge branch 'master' of https://github.com/HiFiLES/HiFiLES-solver into feature_RANS
Added SA turbulence model for GPU
Moved FatalError for 3D RANS
Added shock capturing feature to master - only concentration method implemented currently - works on GPUs only and only for quads currently
fixing merge error in HiFiLES.pro.