Send compressFromMipmapLevel to client in init call.

By sending compressFromMipmapLevel we don't require the client to set it. This removes all the problems when setting the value different on server and client.

src/main/java/bdv/server/CellHandler.java

@@ -430,6 +430,7 @@ public class CellHandler extends ContextHandler {
         }
 
         try (final DataOutputStream dos = new DataOutputStream(response.getOutputStream())) {
+            dos.writeByte(compressionParams.getCompressFromMipmapLevel());
             dos.writeByte(cachedCodebooks.size());
             for (final ICacheFile cacheFile : cachedCodebooks) {
                 cacheFile.writeToStream(dos);