Added two compiler flags:
Added two compiler flags:

-ffloat-store

This prevents 80-bit floats from being stored in 64-bit registers and
restores simtools behaviour on float rounding to be as it was in
version 1.8

-Wfloat-equal

This warns if floats are compared with == or != which are a potential
source of instability

wtsi-npg/simtools,wtsi-npg/simtools