Change for EAS invalid pw case, to allow user to re-enter pw once before raising error.

Summary:
One line change in password_auth to allow password re-rentry.
See D106 too

Test Plan: None

Reviewers: mg

Differential Revision: https://review.inboxapp.com/D107
Remove PYTHONIOENCODING changes in setup.sh

Summary: Accidentally closed D85 by a push, the changes discussed there are actually contained in this rev

Test Plan: None

Reviewers: spang

Differential Revision: https://review.inboxapp.com/D108
Sending replies
D116 update:
Quitting connections, support for to-,cc-,bcc-
Remaining CR changes.
Remaining docstrings.
Migrations.

TODOs left:
- Composing reply bodies to include previous messages
D116 CR changes incl.: Restructuring sendmail directory, more descriptive docstrings, linting, test changes.
Reconciliation gotchas fixed,
Sendmail tests,
Delete behavior for SpoolMessages,

[Not For Review (yet)]: Subtle Reconcile gotchas fixed

Sendmail syncback, reconciliation tests for reply

[Not For Review] v1 delete behavior for SpoolMessages
Tests use new test dump (for sendmail purposes), tests updated too.