J column in the cGamutCusp table is unused

[nick-shaw]

The J column never gets used, so doesn't need to be stored. Only M is used for normalisation

https://github.com/ampas/aces-dev/blob/0b632da885c29f1ca8e816b3995ad5fde976e9ae/lib/Lib.Academy.OutputTransform.ctl#L616

[nick-shaw]

Additionally, REACH_GAMUT_TABLE is probably not the right name, as this one is the cusp, but the table of M values at limitJmax gets called REACH_CUSP_TABLE.

[scottdyer]

Commit e1b72c91da03586b378fe10b355a714147e2500d addresses this issue