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Fixed column count in case of tabs

We were using a count of 1 for each blank (space) of the code, but this was
no correct in the case of tabulators, where we have to add 8.

--- a/lex.c

+++ b/lex.c

@@ -64,10 +64,11 @@

 	extern char parser_out_home;

 	while (isspace(c = getc(yyin))) {

-		if (c == '\n')

-			++linenum, columnum = 1;

-		else

-			++columnum;

+		switch (c) {

+		case '\n': ++linenum, columnum = 1; break;

+		case '\t': columnum += 8;	    break;

+		default:   ++columnum;		    break;

+		}

 	}

 	if (c == EOF) {

 		if (parser_out_home)