fix filter suffix

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@15601 ee4ac58c-ac51-4696-9907-e4b3aa274f04

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

@@ -79,7 +79,7 @@ class IOUtils
   {
     try
     {
-      File filterFile = getFile(vcfFileName, nfiles, "filter");
+      File filterFile = getFile(vcfFileName, nfiles, ".filter");
       FileWriter writer = new FileWriter(filterFile);
       if(IOUtils.isBCF(vcfFileName))
       {