Send an email with the forgotten username instead of displaying it

Currently, when you click on the "Forgot your username?" link ( http://localhost:8080/xwiki/bin/view/XWiki/ForgotUsername ), you type in your email and then your username is displayed on the page.

For security reasons and also consistency with the "Forgot your password?" feature ( http://localhost:8080/xwiki/bin/view/XWiki/ResetPassword ) maybe we should send an email with the username instead of displaying it.