add a title to explain what this checkbox is doing

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1546470 13f79535-47bb-0310-9956-ffa450edef68
[MRM-1769]Can't uploads multiple artifacts of different types
 fix issue deleting temporary files

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1546471 13f79535-47bb-0310-9956-ffa450edef68