move and document type_repr

Author: Jutho

src/groups.jl

@@ -83,7 +83,6 @@ type_repr(::Type{D₄}) = "D₄"
 type_repr(::Type{SU₂}) = "SU₂"
 type_repr(::Type{U₁}) = "U₁"
 type_repr(::Type{CU₁}) = "CU₁"
-type_repr(T::Type) = repr(T)
 
 const GroupTuple = Tuple{Vararg{Group}}
 

src/sectors.jl

@@ -38,6 +38,14 @@ implementation of `Base.iterate(::SectorProductIterator{I}, state...)`.
 """
 abstract type Sector end
 
+"""
+    type_repr(T::Type)
+
+Return a string representation of the type `T`, which is used to modify the default
+way in which `Sector` subtypes are displayed in other objects that depend on them.
+"""
+type_repr(T::Type) = repr(T)
+
 # iterator over the values (i.e., elements of representative set of simple objects)
 # in the sector
 """