[python-ldap] Version 2.5.2 & code cleanup

[Petr Viktorin]

Hello,

As part of python-ldap 2.5.2, the codebase underwent some clean-ups: 
mainly re-formatting to better comply with PEP 8, the coding style used 
by most Python projects nowadays.
These patches often changed all lines in a file, making it hard to apply 
patches built on previous versions. And as I said earlier, I'd like to 
merge Python3 support from pyldap, which is quite a big collection of 
such patches. To make things easier for me, I'd like to do things in 
this order:

- Start with 2.5.1
- From 2.5.2 (and 2.5.3), cherry-pick only the patches that don't 
re-format entire files
- Merge from pyldap
- Re-format files to follow PEP 8 (Python coding guide) and PEP 7 (C 
coding style) whitespace conventions
- Test & release

This wouldn't be a direct continuation of 2.5.x, so it needs a minor 
version, 2.6.0. (Or 3.0, for the symbolism of Python 3 support?)


Does that sound OK to everyone?


-- 
Petr Viktorin