move normalform! to equality_data

heuristic: compute normalform! only if length of automorphism is greater 
than 8

src/new_autgroups.jl

@@ -42,12 +42,10 @@ function Base.:(==)(g::A, h::A) where A<:FPGroupElement{<:AutomorphismGroup}
         hash(g) != hash(h) && return false
     end
 
-    normalform!(g)
-    normalform!(h)
-    word(g) == word(h) && return true
+    length(word(g)) > 8 && normalform!(g)
+    length(word(h)) > 8 && normalform!(h)
 
-    @assert isnormalform(g)
-    @assert isnormalform(h)
+    word(g) == word(h) && return true
 
     img_computed, imh_computed = false, false
 

src/new_hashing.jl

@@ -35,7 +35,6 @@ function _update_savedhash!(g::FPGroupElement, data)
 end
 
 function Base.hash(g::FPGroupElement, h::UInt)
-    normalform!(g)
     _isvalidhash(g) || _update_savedhash!(g, equality_data(g))
     return hash(g.savedhash >> count_ones(__BITFLAGS_MASK) , h)
 end