add PropertyTGroup, SymmetricGroup, GAPGroup hierarchy

groups/Allgroups.jl

@@ -0,0 +1,26 @@
+module PropertyTGroups
+
+using AbstractAlgebra
+using Nemo
+using Groups
+
+export PropertyTGroup, SymmetricGroup, GAPGroup
+
+abstract type PropertyTGroup end
+
+abstract type SymmetricGroup <: PropertyTGroup end
+
+abstract type GAPGroup <: PropertyTGroup end
+
+include("autfreegroup.jl")
+include("speciallinear.jl")
+
+Comm(x,y) = x*y*x^-1*y^-1
+
+generatingset(G::GAPGroup) = gens(group(G))
+
+include("mappingclassgroup.jl")
+include("higman.jl")
+include("caprace.jl")
+
+end # of module PropertyTGroups