Add major changes section

Fix some repetition
This changelog was about changes that impact users

Post 1.11.0 we should remove this changelog and refer people to release notes.
The release notes should mention changes that will require retooling or involve
changed behaviour.
Fix wording
Correct intersphinx ref
There where no special notes for 0.8
Use :option: links and program naming

Doesn't work, but we can fix that in future
DOCS: Fix sentence
Remove executable bits
Remove requirements for Python < 2.5
Fix wrapping within \"

The problem was that " was added with the new hungry space part of
TextWrapper.wordsep_re.  This resulted in \" being seen as a word seperator.
Simply removing " from that re returned the bahviour to normal.

Fix bug 3140
Correct sourceforge upload command
Docs: improve text
Adjust release date
Version 1.11.0-rc1
Docs: Fix example in styleguide

Now the imports example conforms with the guidelines present a few lines above.
Output source when a unit is fuzzy

Fixes bug 3145
Don't use python-Levenshtein 0.11.0

A fix is here https://github.com/ztane/python-Levenshtein/pull/1

0.11.0 add Python 3 support, so not something we really need right now.
So until the fix lands, and since it is so close to a final release, let
us be conservative and make sure we're only using the working version.
Docs: Fix minor nit on styleguide example
Lets rather use our requirements files

Prevents situation where we have to fix things in multiple place i.e.
the python-Levenshtein breakage.
Docs: Small fixes in releasing notes