[GRASS5] Updated d.vect.thematic

[Hamish]

> It's more easy to start from an exact value (eg: 0) and after select 
> the range. The user can make a first screening like now and he see 
> all values (automatic choice) and after he inserts the custom values 
> (custom choice) for range (eg: 0 20 30 50 100 200 300 >500...).
> This is an idea


d.legend has range= and use= options to do this sort of thing for raster
data. It would be nice to use the same methods for vector legends
created with other modules so that it is easier for new users to learn.


Hamish