[O] spreadsheet hline-relative (I) field references

[Greg Minshall]

hi.  i've two suggestions/requests/queries about using hline-relative
references, e.g., @III, in formulas in org-mode spreadsheets.

1.  i would like to use this syntax on the *left* hand side of a
formula.  e.g.,
----
#+TBLFM: @I$2=vsum(@address@hidden)
----
(meaning, the second column in the first row after the first hline gets
the sum of all the first columns in the rows between the first and
second hlines).

2.  i have occasions where i would like to address hlines from the
bottom, rather than from the top.  is there a syntax for this?  if not,
maybe something like @Z (and all its friends, including @ZZZ, etc.)?

comments?

cheers, Greg