gyre_Conv_flux_ptrb

Fixed possible floating-point overflow in count_windings()

Added -ftrampoline-impl=heap build flag to avoid executable stack

Bumped forum to v1.2.3

Settled on using procedure pointers for dimension-speficic dispatch; although this comes with a slight performance overhead, the improvement to code simplicity and elegance outweights the hit

Revert "Updated refs for ad/num", since the refs were calculated with