Modernize number literals
Use Python-3 compatible syntax, without breaking compatibility with py 2.7
- Octals literals start with 0o to prevent confusion
- The "L" at the end of large int literals is not required as they use
long on Python 2 automatically.
- Using 'int' instead of 'long' for small numbers is OK in all cases except
strict type checking checking, e.g. type(0).
Reviewed-By: Jan Cholasta <firstname.lastname@example.org>