core/segment.h: rename 'UNSEG too few J/V' to 'UNSEG only V/J'

This better reflects what we find in the reads:
UNSEG_TOO_FEW_V actually means that the J segment was detected, above
the e-value threshold.

algo/core/segment.h

@@ -46,7 +46,7 @@ enum SEGMENTED { NOT_PROCESSED,
 		 TOTAL_SEG_AND_WINDOW,
                  SEG_PLUS, SEG_MINUS,
                  UNSEG_TOO_SHORT, UNSEG_STRAND_NOT_CONSISTENT,
-		 UNSEG_TOO_FEW_ZERO,  UNSEG_TOO_FEW_V, UNSEG_TOO_FEW_J, 
+		 UNSEG_TOO_FEW_ZERO,  UNSEG_TOO_FEW_J, UNSEG_TOO_FEW_V,
                  UNSEG_BAD_DELTA_MIN, UNSEG_AMBIGUOUS,
 		 UNSEG_TOO_SHORT_FOR_WINDOW,
 
@@ -55,7 +55,7 @@ const char* const segmented_mesg[] = { "?",
                                        "SEG",
                                        "SEG_+", "SEG_-",
                                        "UNSEG too short", "UNSEG strand",
-				       "UNSEG too few (0)", "UNSEG too few V", "UNSEG too few J",
+				       "UNSEG too few V/J", "UNSEG only V", "UNSEG only J",
 				       "UNSEG < delta_min", "UNSEG ambiguous",
                                        "UNSEG too short w",
                                       } ;