Bounded lists as explicit enumerations

[RandallYe]

A bounded list for a finite type is enumerable. It is nice to have bounded lists as instances of the enum class, then we can access the explicit enumerations of a bounded list through T_enum.

[RandallYe]

@simondfoster I saw you have an instantiation for enum. Now there is another issue for code generation. The following code in Isabelle

value "enum_class.enum:: (Chemical_Angle blist[2]) list"

will lead to an error: No code equations for blist_of_list