[GRASS5] 5.7.1

[Radim Blazek]

Revised TODO < 6.0:

- include -> include/grass (volunteer? tools/install-header?)
- map overwriting - grass variable also for rasters, default no
                    (volunteer?)
- WIND - WIND3 sync
- v/r.random add cats
- all vector modules (help me!):
     - check option and flag names (native speakers welcome)
     - check if table is copied
     - check multicats behaviour, especially more cats in the same layer
- options:
     - short description/prompt (for GUI)?
     - description for each item in options list of option
        (for manual and GUI)

Radim