python. New grammar for non-extendable type system, #74.
python. Parsing files by filepaths, #74.
python. Simplifying language classes, #74.
python. Simple definitions, values and a module, #74.
python. Enums, #74.
python. Messages, #74.
python. Interfaces, #74.
python. Parsing and looking up enum values, #74.
python. Message subtypes, #74.
python. Field inheritances, #74.
python. Method inheritance, #74.
python. Message in fields, interface in methods, str methods, #74.
python. SymbolTable is a subtype of OrderedDict, #74.
python. Parsing simple imports "from module import names", #46.
python. Small fixes for new SymbolTable, fixed #74.
python. Import linking, look ups, fixed #46.
python. Set pdef, module in add_module and add_definition.
python. Polymorphic definition construction from AST nodes, #74.
python. PdefException, fixed #77.