[GRASS5] Parser

I think that we could add new fields in Options and Flags:
1) char *label; - for item label in GUI, description is usually too long
2) char *descriptions; a description for each option in Option,
    separated by ';', for example:
    tool_opt->options_decription =
           "break;break lines at intersections;"
           "rmdupl;remove duplicate lines";

Radim

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