merged overview.php into list-domain.php and list-virtual.php

list-domain.php:
- added several admin/superadmin switches and permission checks
- merged GET and POST code
- Note: still different templates for superadmins (admin_list-domain.tpl)
  and admins (overview-get.tpl) because of large layout difference

list-virtual.php:
- added several admin/superadmin switches and permission checks
- added check for admins without any domains (redirects to domain list,
  which can handle this situation)
- migrated FIXME from overview.php 
  -> David, please review the query and remove the FIXME afterwards

overview.php:
- DELETED - no longer needed

overview.tpl:
- RENAMED overview.tpl to list-virtual.tpl
- removed admin/superadmin filename switch
- removed $incpath switch for images

menu.tpl:
- menu for domain admins now has "domain list" and "virtual list"
  instead of "overview"

delete.php, edit-active.php, edit-alias.php, edit-mailbox.php, search.php:
- changed redirect to list-virtual.php

overview-get.tpl:
- changed link to list-virtual.php

main.tpl:
- changed overview link to list-domain.php



git-svn-id: https://svn.code.sf.net/p/postfixadmin/code/trunk@181 a1433add-5e2c-0410-b055-b7f2511e0802

edit-alias.php

@@ -118,11 +118,7 @@ if ($_SERVER['REQUEST_METHOD'] == "POST")
       {
          db_log ($SESSID_USERNAME, $fDomain, 'edit_alias', "$fAddress -> $goto");
 
-         if (authentication_has_role('global-admin')) {
-            header ("Location: list-virtual.php?domain=$fDomain");
-         } else {
-            header ("Location: overview.php?domain=$fDomain");
-         }
+         header ("Location: list-virtual.php?domain=$fDomain");
          exit;
       }
    }