Bug 404580 Provide information like preview text, subject and sender in mail notification window - as in Thunderbird ui-r=Neil r=Neil.

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rename : mail/base/content/newmailalert.js => suite/mailnews/newmailalert.js
rename : mail/base/content/newmailalert.xul => suite/mailnews/newmailalert.xul
rename : mail/themes/qute/mail/newmailalert.css => suite/themes/classic/messenger/newmailalert.css
rename : mail/themes/qute/mail/newmailalert.css => suite/themes/modern/messenger/newmailalert.css