[GRASS5] [bug #1465] (grass) v.proj datum conversion fails. Typo in code main.c

[Markus Neteler via RT]

Eric has submitted the C changes.
I have submitted the tcltkgrass changes, thanks.

It's true (but wanted?) that -l doesn't work in tcltkgrass.
Reason is

 if(isatty(0))  /* check if on command line */
(line 217).

Should we remove that if condition?

 Markus

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