fixes #1098 make checksum computation block size configurable, and smaller by default

admin/themes/default/js/batchManagerGlobal.js

@@ -420,7 +420,7 @@ jQuery('#sync_md5sum').click(function(e) {
 
   var addBlockSize = Math.min(
     Number((jQuery('#md5sum_to_add').data('origin') / 2).toFixed()),
-    1000
+    conf.checksum_compute_blocksize
   );
   add_md5sum_block(addBlockSize);
 

admin/themes/default/template/batch_manager_global.tpl

@@ -26,6 +26,10 @@ var lang = {
 	AreYouSure: "{'Are you sure?'|translate|escape:'javascript'}"
 };
 
+var conf = {
+  checksum_compute_blocksize: {$conf_checksum_compute_blocksize},
+};
+
 jQuery(document).ready(function() {
 
   jQuery('.help-popin').colorbox({ width:"500px" });