[ENH] correct Jaccard output header

src/jaccard/jaccard.cpp

@@ -85,7 +85,7 @@ void Jaccard::CalculateJaccard() {
     
     // header
     cout << "intersection\t"
-         << "union\t"
+         << "union-intersection\t"
          << "jaccard\t"
          << "n_intersections"
          << endl;

test/jaccard/test-jaccard.sh

@@ -14,7 +14,7 @@ check()
 ###########################################################
 echo "    jaccard.t01...\c"
 echo \
-"intersection	union	jaccard	n_intersections
+"intersection	union-intersection	jaccard	n_intersections
 110	110	1	2" > exp
 $BT jaccard -a a.bed -b a.bed > obs
 check obs exp
@@ -23,7 +23,7 @@ rm obs exp
 
 echo "    jaccard.t02...\c"
 echo \
-"intersection	union	jaccard	n_intersections
+"intersection	union-intersection	jaccard	n_intersections
 10	140	0.0714286	1" > exp
 $BT jaccard -a a.bed -b b.bed > obs
 check obs exp
@@ -31,7 +31,7 @@ rm obs exp
 
 echo "    jaccard.t03...\c"
 echo \
-"intersection	union	jaccard	n_intersections
+"intersection	union-intersection	jaccard	n_intersections
 10	200	0.05	1" > exp
 $BT jaccard -a a.bed -b c.bed > obs
 check obs exp
@@ -40,7 +40,7 @@ rm obs exp
 
 echo "    jaccard.t04...\c"
 echo \
-"intersection	union	jaccard	n_intersections
+"intersection	union-intersection	jaccard	n_intersections
 0	210	0	0" > exp
 $BT jaccard -a a.bed -b d.bed > obs
 check obs exp
@@ -51,7 +51,7 @@ rm obs exp
 ###########################################################
 echo "    jaccard.t05...\c"
 echo \
-"intersection	union	jaccard	n_intersections
+"intersection	union-intersection	jaccard	n_intersections
 10	140	0.0714286	1" > exp
 cat a.bed | $BT jaccard -a - -b b.bed > obs
 check obs exp