Fix powerline style

Specifically I searched for all lines that are more then one tab off compared to 
the previous line with

    BufGrep /\(^\t\+\)\S.*\n\1\t\t\+/

and replaced them with something more appropriate. Most of time this resulted in 
a few more newlines, but there are cases when I used mixed tabs/spaces 
indentation+alignment.
Merge pull request #987 from ZyX-I/style

Fix powerline style