[full-history] Small fixes to the code

[ramiro <rm0 _at_ gmx.net>]

This patch fixes:

• There are some TAB chars indenting the Python code. From the context it can be deduced that they were used to represent 8 spaces.
• In django/contrib/history/models.py: The Pickle.dumps call in save_new_revision() uses named protocol=0 as a second parameter. It gives me an error under Python 2.3 (and this result in the the save operation failing always) but from the Python 2.5 [1]documentation it's clear than nothing has changed since 2.3 times in that method. The fix is just call it using 0 or not use it at all.

This patch is against the branch code as of [4459]

[utrebec]

(In [4739]) [full-history]
Refs #3428 -- Removed 'protocol=0' parameter

[Malcolm Tredinnick]

The full-history branch is inactive and won't be updated any further. Alternate solutions to the problem can be attempted without changing Django's core nearly as much these days (it's a lot more customisable) and approaches are encouraged. But we aren't going to apply patches to the branch.