Allow comments in Eco grammars

[ptersilie]

Grammars written in Eco don't currently allow comments. Comments would be handy tho.

[ltratt]

Agreed. We should use Yacc's comment syntax (/* ... */) I guess? Even though it's ugly, it's portable... [Though, personally, I wouldn't object to adding // as a secondary comment style, or even instead of /* ... */.]

[ptersilie]

I'll probably just do both.

[ltratt]

I won't object :)