Add python send_email.py helper that provides portable mail client.
Add python send_email.py helper that provides portable mail client.

send_email.py acts like mail, Mail, mailx, email (cygwin), etc and provides a
command line interface for sending email. It provides a consistent, portable
feature unlike the other client listed. This is done using python libraries.

Right now, it uses the envelopes library. That will probably change, though, to
just use the python smtp library stuff. Otherwise, we will require ./nightly
users to install envelopes, which is not the worst thing, but a bit of a
hassle. It should be easy to convert envelopes -> python email.

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