Minor improvements to the diagnostic algorithms section in visualisation_and_diagnostics.tex.
Minor improvements to the diagnostic algorithms section in visualisation_and_diagnostics.tex.

rjferrier/fluidity,rjferrier/fluidity,iakovos-panourgias/fluidity,jrper/fluidity,rjferrier/fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,jrper/fluidity,rjferrier/fluidity,rjferrier/fluidity,jjo31/ATHAM-Fluidity,jjo31/ATHAM-Fluidity,jrper/fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,iakovos-panourgias/fluidity,jjo31/ATHAM-Fluidity,jrper/fluidity,jrper/fluidity,iakovos-panourgias/fluidity