Hardcoded g3 in SPheno output

[JPEllis]

There's a hard-coded references to `g3` in on line 421 of SPhenoCouplingsDecay.m which probably shouldn't be there. For example, I've called my strong coupling `gSU3C` which obviously won't work there (despite being correctly used elsewhere, such as in the definition of `AlphaSQ`).

Note that I also see a lot of mentions to other gauge couplings.

Josh

[FStaub]

Thanks, the g3 is replaced now by "strongCoupling".

Florian