Segment: Add a new unsegmentation cause: UNSEG_AMBIGUOUS

It happens when we have V and J labels but when we're not able to segment because one
of the criteria on the number of V compared to J is not fulfilled

algo/core/segment.h

@@ -22,13 +22,13 @@ using namespace std;
 
 enum SEGMENTED { DONT_KNOW, SEG_PLUS, SEG_MINUS, UNSEG_TOO_SHORT, UNSEG_STRAND_NOT_CONSISTENT, 
 		 UNSEG_TOO_FEW_ZERO,  UNSEG_TOO_FEW_V, UNSEG_TOO_FEW_J, 
-		 UNSEG_BAD_DELTA_MIN, UNSEG_BAD_DELTA_MAX,
+		 UNSEG_BAD_DELTA_MIN, UNSEG_BAD_DELTA_MAX, UNSEG_AMBIGUOUS,
 		 TOTAL_SEG_AND_WINDOW, 
 		 TOTAL_SEG_BUT_TOO_SHORT_FOR_THE_WINDOW,
 		 STATS_SIZE } ;
 const char* const segmented_mesg[] = { "?", "SEG_+", "SEG_-", "UNSEG too short", "UNSEG strand",  
 				       "UNSEG too few (zero)", "UNSEG too few V", "UNSEG too few J",
-				       "UNSEG < delta_min", "UNSEG > delta_max",
+				       "UNSEG < delta_min", "UNSEG > delta_max", "UNSEG ambiguous",
                                        "= SEG, with window",
                                        "= SEG, but no window",
                                       } ;