Improve cov-diff script to account for new files.

scripts/test/cov-diff

@@ -7,9 +7,13 @@
 DIRA="$1"
 DIRB="$2"
 
-for A in $DIRA/*; do
-  B=$DIRB/`basename $A`
-  perl -pe 's/^\s*\!*\d+:/        1:/; s/^([^:]+:)[\d\s]+:/$1/; s/^ *-:(Runs|Programs):.*//;' "$A" > "$A.tmp"
+for B in $DIRB/*; do
+  A=$DIRA/`basename $B`
+  if [ -f $A ]; then
+      perl -pe 's/^\s*\!*\d+:/        1:/; s/^([^:]+:)[\d\s]+:/$1/; s/^ *-:(Runs|Programs):.*//;' "$A" > "$A.tmp"
+  else
+      cat /dev/null > "$A.tmp"
+  fi
   perl -pe 's/^\s*\!*\d+:/        1:/; s/^([^:]+:)[\d\s]+:/$1/; s/^ *-:(Runs|Programs):.*//;' "$B" > "$B.tmp"
   diff -u "$A.tmp" "$B.tmp"
   rm "$A.tmp" "$B.tmp"