this fixes the smtp credential issues where emails auto default to use settings.

however with using email services like SES, the SMTP login might not be a valid email address so it fails hard.

following examples from feature fix for django password reset from_email fixes (https://github.com/django/django/commit/4084bc7354), able to add new settings to auto default reply to.

first commit to merged hq codebase!
updating default notification email to use the settings set one, not EMAIL_LOGIN or EMAIL_HOST_USER
moving and grouping email addresses together
setting email_from in send_HTML_email calls
fixing kwarg error, formatting
remove line
Merge pull request #232 from dimagi/email_notifications

this fixes the smtp credential issues where emails auto default to use s...