Extracted Python path walking and fixed broken symlink check (PY-10534)
Made 'dict.fromkeys' a '@staticmethod' (PY-11169)
Fixed signatures of str() and unicode() (PY-11162)
Removed properties-based stdlib types database
Added canonical import path for names of 'sqlite3' module
'os.error' is now defined in Python skeletons
Decimal is a subclass of numbers.Number
Use constants for names of the 'numbers' classes
Fixed resolving unqualified classes with user-defined skeletons in type strings
Don't use relative import resolving for references in user skeletons
Added 'tuples' to Python dictionary
Added python-helpers to .gitignore