[GRASS-dev] g.proj -f does not work for all print options

[Nikos Alexandris]

I was testing g.proj from trunk now, and there is this:

```
g.proj -f
ERROR: No output format specified, define one of flags -p, -g, -j, or -w
```

whereas only `-fj` and `-fw` will work. `-fp`, `-fg` do not get
flattened.

Nikos