algo/core/kmeraffect.cpp: Fix KmerAffect comparison

We didn't take into account the length (as it was added later). This is now fixed.

algo/core/kmeraffect.cpp

@@ -44,13 +44,15 @@ bool operator==(const affect_t &a1, const affect_t &a2) {
      || a1.length == (unsigned char) ~0 || a2.length == (unsigned char)~0 || a1.length == a2.length);
 }
 bool operator<(const affect_t &a1, const affect_t &a2) {
-  return a1.c < a2.c;
+  return a1.c < a2.c
+    || (a1.c == a2.c && a1.length < a2.length
+        && affect_char(a1) != AFFECT_AMBIGUOUS_CHAR && affect_char(a1) != AFFECT_UNKNOWN_CHAR);
 }
 bool operator>(const affect_t &a1, const affect_t &a2) {
-  return a1.c > a2.c;
+  return ! (a1 <= a2);
 }
 bool operator<=(const affect_t &a1, const affect_t &a2) {
-  return ! (a1 > a2);
+  return (a1 < a2) || (a1 == a2);
 }
 bool operator>=(const affect_t &a1, const affect_t &a2) {
   return ! (a1 < a2);