[GRASS5] Raster files suggestion: new directory layout

[Markus Neteler]

Hi,

another proposal: Let's simplify the raster file directory layout
and have all files related to a raster map staying in a single
directory (such as the 5.7 vector files). We already have discussed
it some time ago.

Advantages:
- clean and understandable file structure
- cleanup of raster API which is hard to understand at time
- user can easily copy a map into another machine
  (say, for backup reasons or whatever)
- more?

Disadvantages:
- a script to migrate raster databases is needed 
  (as we once did for LZW elimination)

When to implement it:
- I suggest to do it asap in GRASS 5.7. While at migrating
  their vector databases the users can also migrate the raster
  databases (which is simply a 'mv' of the files).

It could be implemented in two phases:
- first read old raster file directory layout, but write new
  layout
- in a later version remove support for reading old layout


Markus