YEARFRAC again

[Eike Rathke <erack@sun.com>]

Hi,

We already found out that OOo calculation for YEARFRAC's ACTUAL mode in
some corner cases is wrong, so I'll remove that TODO. However, there's
another TODO for YEARFRAC

| TODO: Applications should probably implement the other actual/actual
| systems; we need to allocate “basis” numbers to them that everyone
| agrees on.

I don't think we should define other systems there, for
interoperability's sake. I'll remove that as well if noone disagrees.

  Eike

-- 
Automatic string conversions considered dangerous. They are the GOTO statements
of spreadsheets.  --Robert Weir on the OpenDocument formula subcommittee's list.