Release of G'MIC 1.7.6

@David_Tschumperle, @garagecoder, maybe I’m little bit lazy :wink: . I will have a look into the tutorials made by @paulmatth (Paul Matthijse),

then I can customize my filters. But to programm filters by myself, will be to complicated. I think it would take years to make something useful. So thank you all to make all these things possible within G’MIC (for GIMP).