Added two element types that are among those generated by gmsh. The

element types are
- C3D6, a 6 nodes element that produces the key Wedge6
- CPS3, a 3 nodes element thta produces the key CPS3 (Tri3 alerady
  exists)

I think they are convenient as you do not have to change the element
names in the input file before loading the meash with AbaquReader.jl

src/parse_mesh.jl

@@ -7,6 +7,9 @@ import Base.parse
 element_has_nodes(::Type{Val{:C3D4}}) = 4
 element_has_type( ::Type{Val{:C3D4}}) = :Tet4
 
+element_has_nodes(::Type{Val{:C3D6}}) = 6
+element_has_type( ::Type{Val{:C3D6}}) = :Wedge6
+
 element_has_nodes(::Type{Val{:C3D4H}}) = 4
 element_has_type( ::Type{Val{:C3D4H}}) = :Tet4
 
@@ -27,6 +30,9 @@ element_has_nodes(::Type{Val{:C3D20E}}) = 20
 element_has_nodes(::Type{Val{:S3}}) = 3
 element_has_type( ::Type{Val{:S3}}) = :Tri3
 
+element_has_nodes(::Type{Val{:CPS3}}) = 3
+element_has_type( ::Type{Val{:CPS3}}) = :CPS3
+
 element_has_nodes(::Type{Val{:STRI65}}) = 6
 element_has_type(::Type{Val{:STRI65}}) = :Tri6