Clear login related cookies before starting the login process.
Rename logger.xml to application-logger.xm or Play igonres it.
Use the login popup dialog when signing in to create new site.
Minor refactoring, rename startAuthenticationInPopupWindow().
Reuse the login popup also when creating embedded comment sites.
Implement creation of new password users.
Use the login popup to login to the admin page

And hide create user button and guest login button when they don't make
sense.
Reuse the login popup for the initial installation.
Remove and comment out unused login/signup code.
Fix login bugs: return-to-undefined, not closing dialog.
Merge branch 'topic-rewrite-create-site-login' into topic-usernames.