small fixes

* We now know why the prefs for Mail were so hard to find. We were looking in the wrong place. Should be fixed.
* I noticed the plug-in had some logic to select a from address based on the recipients, but it wasn't getting used because of changes I made in E-mail Support. I reworked it so it will still use the default supplied by E-mail Support, but it will override that in cases where the first recipient's domain matches the domain of one of your accounts.
* I figured out why the direct actions were hit or miss for me. Most (but not all) of the time, the password string from the keychain contained extra data at the end. It's now truncated to the reported length in those cases.
* Fixed a memory leak
* And there's an old commit from October in here.