Fix remote references that contain pointers to first/last rows/columns

Fix remote references that contain pointers to first/last rows/columns

* lisp/org-table.el (org-table-formula-handle-first/last-rc): Do not
expand pointers to first/last row/column that are inside a call
to `remote'.
(org-table-get-remote-range): Expand pointers to first/last
row/column.

Wu Feng writes:

> Hello,
>
> First, please check below simple example, I defined two tables (T1 and
> T2). In table-2, I remotely refer to the @>$1 (last row, column 1) and
> $LR2 (last row, column 2) of T1.
>
> #+TBLNAME: T1
> | 11 | 12 |
> | 21 | 22 |
> | 31 | 32 |
>
> #+TBLNAME: T2
> | xxx | xxx | xxx | xxx |
> | #   |  21 |  32 |     |
> #+TBLFM: @>$3=remote(T1,$LR2)::@>$2=remote(T1,@>$1)
>
> Obviously, the expected results are:
>
> - remote(T1,@>$1) is replaced by 31
> - remote(T1,$LR2) is replaced by 32
>
> But I got 21 for remote(T1,@>$1). The $LR version works perfectly
> (though the manual says $LR is out-dated)
>
> Below are debug info when evaluating remote(T1,@>$1). Looks like @> in
> the remote reference is mapped to the last row of the current table, not
> of the remote table.
>
> Substitution history of formula
> Orig:   remote(T1,@2$1)
> $xyz->  remote(T1,@2$1)
> @r$c->  (21)
> $1->    (21)
> Result: 21
> Format: NONE
> Final:  21
>
> Emacs  : GNU Emacs 23.3.1 (i686-pc-linux-gnu, GTK+ Version 2.24.6)
> of 2011-09-13 on shirley
> Package: Org-mode version 7.7