Resolve "add NON_MATCHING_ALPHA attribute to overlay"

#2263

converter/src/main/java/lcsb/mapviewer/converter/zip/ZipEntryFileFactory.java

@@ -23,6 +23,8 @@ public class ZipEntryFileFactory {
    * corresponding to the {@link LayoutZipEntryFile#type type}.
    */
   public static final String LAYOUT_HEADER_PARAM_TYPE = "TYPE";
+  
+  public static final String NON_MATCHING_ALPHA = "NON_MATCHING_ALPHA";
   /**
    * Name of the parameter in {@link LayoutZipEntryFile file describing layout}
    * corresponding to the {@link LayoutZipEntryFile#genomeType genome type}.