Make -k and -K take ranges (x-y) and lists (a,b,c).

Examples include:
    -k 10
    -k 10,11,12
    -k 10-12
    -k 0,50-99

crumble.1

@@ -279,9 +279,9 @@ applies to all data, even those that are otherwise kept intact.
 
 .PP
 .TP
-\fB-k\fR \fIqual\fR
+\fB-k\fR \fIqual_range\fR
 .TQ
-\fB-K\fR \fIqual\fR
+\fB-K\fR \fIqual_range\fR
 .TQ
 \fB-N\fR
 These options mark specific quality values as ones we wish to keep.
@@ -303,6 +303,9 @@ the same column.  The intention of this is to not over-emphasise high
 quality discrepant bases relative to the agreeing bases, which may
 have been quantised or capped using other options.
 
+The \fIqual_range\fR argument can be a single quality ("93"), a start
+and end range ("90-99"), and also a comma separated list ("0,90-99").
+
 .PP
 .TP
 \fB-d\fR \fIqual\fR

snp_score.c

@@ -2360,11 +2360,19 @@ int main(int argc, char **argv) {
 	    break;
 
 	case 'k':
-	    preserve_qual[MAX(0,MIN(255,atoi(optarg)))] = 1;
-	    break;
-	case 'K':
-	    preserve_qual[MAX(0,MIN(255,atoi(optarg)))] = 2;
+	case 'K': {
+	    char *endp = optarg;
+	    do {
+		long q1 = strtol(endp, &endp, 10), q2 = q1;
+		if (*endp == '-')
+		    q2 = strtol(endp+1, &endp, 10);
+		do {
+		    preserve_qual[MAX(0,MIN(255,q1))] = 1 + (opt == 'K');
+		} while (++q1 <= q2);
+	    } while (*endp++ == ',');
+
 	    break;
+	}
 	case 'N':
 	    params.perfect_col = 1;
 	    break;