Prevent admin username and admin password to be the same
Wikifundi (mediawiki actually) does not allow the admin username and password to be the same.
Because it's a good general measure, we should enforce it in pibox by not letting user set it the same.
We'll also need to change our presets as all of them contain admin:admin
. New default will be admin:admin-password
.
@Kelson, will you take care of the presets?