[O] different color for calculated cells in tables

[Daniel Clemente]

Hi, 

  I would like to easily view which table cells are calculated, that is, which 
values would be overwritten if I updated the table (C-u C-u C-u C-c C-c)
  We can use a different cell background color (maybe with overlays?) for the 
automatic cells, and the normal one for „manual entry“ cells.
  This coloring would happen on load and after each table update; no need to do 
it in real time.


  A table example:

|     a |    b |   percent |    m | multiple |
|-------+------+-----------+------+----------|
|    15 |  112 |     16.80 |    2 |     33.6 |
|     2 |   15 |      0.30 |  2.1 |     0.63 |
|   1.2 |    7 |      0.08 | 12.5 |       1. |
|-------+------+-----------+------+----------|
| max%→ | 16.8 | 5.7266667 |    1 |        0 |
#+TBLFM: 
$3=($1/100.0)*$2;%.2f::$5=$3*$4::@5$2=vmax(@address@hidden)::@5$3=vmean(@address@hidden)::@5$4=$3>5.2::@5$5=0

  The „automatic“ cells (and thus highlighted) would be: 16.80, 33.6, 0.30, 
0.63, 0.08, 1, 16.8, 5.7266667, 1, 0. But I had to look at the TBLFM to find 
it, and that's not easy.

  This is an idea, but the code's missing. A similar code exists for cell 
highlighting from the formula editor window (C-c '); this would help.


  Any comments on the difficulty of this?


Daniel