+ setup_demo gives errors under postgres
+ setup_demo can save special chars in the admin name
- renamed setup_demo into admin_account, as setting up demo accounts is the least used function of it
- fixed warning db::delete missing params, if delete_all was checked
- fixed a problem php5 complained about, which is present in php4 too: arrays in $GLOBALS[egw][server] are NOT unserialized. As this seems to be only used for the lang_ctimes, I just took care of it here
