LIBDRUM-152. Move local customizations for dspace to the addition module.

Checking in three missed files from dspace41 source to be customized.

https://issues.umd.edu/browse/LIBDRUM-152
LIBDRUM-152. Move local customizations for dspace to the addition module.

- Added XMLWorkflowItem customization (https://issues.umd.edu/browse/LIBDRUM-144)
- Added PopupTag and AuthorizeAdminServlet customizations from 1.7

https://issues.umd.edu/browse/LIBDRUM-152