[2.1] Total tax should be +, not -
changed the address format in plain text emails

Conflicts:

	templates/emails/plain/email-addresses.php
Readme
woocommerce_get_order_item_totals_excl_free_fees for 2.1

From #5660
Correctly clear transients, including sale transient.

Backspaces caused the issue. Fixes #5734