fix necessary when adding a cube which isn't listed in fs dependencies of the instance

more sensible default values to c-c "create" inputs * db name default to instance name * db user default to user's login on 'user' mode * admin account login default to 'admin' note: dirty hack to make default_instance_id method available

[javascript] fid form / onfailure behaviour If onfailure is specified, it should be done _before_ any default / standard CW action is done. The callback signature should be the same as the onsuccess one. If the onfailure callback returns true, the default actions will still take place afterwards, otherwise (i.e. return false), the processing stops directly after the callback.

add set_page_data as well