cleaned up processing of metadata from diverse origins (doc,extattrs,localfields)

src/filters/rclimg

@@ -50,7 +50,7 @@ $headAndBody = 1;
 sub xapianTag {
 	my $imgtag = shift;
 	while ( ( $tagre, $xapiantag) = each %{$tagMap} ) {
-		return $xapiantag  if $imgtag =~ /$tagre/i;
+		return $xapiantag  if $imgtag =~ /^$tagre$/i;
 	}
 	return undef;
 }

src/filters/rclpdf

@@ -132,7 +132,13 @@ awk 'BEGIN'\
     gsub(/>/, "\\>", mid)
     mid = "<title>" mid "</title>"
     $0 = part1 mid part2
-  } 
+  }
+
+  # Recoll treats "Subject" as a "title" element (based on emails). The PDF
+  # "Subject" metadata field is more like an HTML "description"
+  if(doescape == 0 && $0 ~ /<meta ?name="Subject"/){
+      gsub(/="Subject"/, "=\"Description\"", $0)
+  }
 
   if ($0 == "<pre>"){
     # Begin of body text. need to escape some chars from now on as