re: Spelling fixes (replace iff with if)

[Dan Kegel]

lav at etersoft.ru wrote:
> - replace 'iff' with 'if' (just a spelling fixes)

'iff' is shorthand for 'if and only if'.
http://en.wikipedia.org/wiki/If_and_only_if

So many of those 'typos' might actually be correct.
Careful!
- Dan