[O] Table rows and ranges as LHS of formulas

[Carsten Dominik]

Hi everyone,

A frequently requested feature for tables has been to
be able to define row formulas in a way similar to column
formulas.  The patch below allows things like 

   @3=
   @address@hidden
   @address@hidden

as the left hand side for table formulas in order to
write a formula that is valid for an entire column or
for a rectangular section in a table.

Note that in contrast to column formulas, @3= will not
automatically skip a "header column" or field formulas in the
same row.  In fact, making both a range formula and a field
point to the same field is forbidden and throws an error.
So to have a formula apply to all but the first column, use
something like this:

    @address@hidden

Testing is welcome, but I am confident that this works
pretty well.

Bastien, please let me know if you want to have this integrated
before the release, then I will do so.

0001-Implement-table-formulas-that-apply-to-field-ranges.patch
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