Mention SQLite database format change in UPGRADING file (#1488983)
Add 0.9-rc to releases list
Move spellcheck options section below signature options section
Fix javascript errors when working in a page opened with taget="_blank"
Test content_id with isset instead of a true/false value.

This broke html email in which one image had Content-ID: <0>, which is a
valid value but evaulates to false in this test.
Support IMAP MOVE extension [RFC 6851]
Merge pull request #60 from thijskh/master

Test content_id with isset instead of a true/false value
Remove font style definition on td, th, div, p elements (#1488408)
Fix so task name can really contain all from a-z0-9_- characters (#1488941)
Trigger 'refresh' hook in mail view
Fix LIMIT/OFFSET queries handling on MS SQL Server (#1488984) - require version 2005+
Fix handling of empty $uids argument in change_flag()
Fix forward as attachment bug with editormode != 1 (#1488991)
Don't show fake address - phishing prevention (#1488981)