determine if BCF is VCF v4 using the header

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@15215 ee4ac58c-ac51-4696-9907-e4b3aa274f04

uk/ac/sanger/artemis/components/variant/VCFview.java

@@ -516,7 +516,11 @@ public class VCFview extends JPanel
       if(IOUtils.isBCF(fileName))
       {
         vcfReaders[index] = new BCFReader(new File(vcfFiles.get(index)));
-        return ((BCFReader)vcfReaders[index]).headerToString();
+  
+        String hdr = ((BCFReader)vcfReaders[index]).headerToString();
+        if(hdr.indexOf("VCFv4") > -1)
+          vcf_v4 = true;
+        return hdr;
       }
 
       BlockCompressedInputStream is =