Closes #5076 Conversation viewer now fills an email min window automatically
Elements of in email's HTML HEAD end up in document body of Conversation Viewer: Closes #6896
Remove Copy Link: Closes #6989
GSettings doesn't respect --prefix: Closes #6001
Fix .desktop file warning on Raring: Closes #6884
Notifications for new email don't appear in conversation list: Closes #6698

The nuclear option: rip out *all* Message-IDs in the reverse-lookup
map in ConversationMonitor, not merely the Message-IDs of the
remaining emails in the conversation.

One reason this is appropriate: if the conversation contained
reference to an email that was never received by the user, that would
cause a Message-ID to linger in the reverse lookup table, making a removed
conversation appear like it's not new when another email for the
conversation arrives.
Closes #6919 Find toolbar mnemonics
Malicious HTML link checker: Closes #6933

Pops up a small warning if the user clicks on a link that doesn't
match URL-looking text.
Single-click on sidebar containers opens them: Closes #4985
Don't delay sending mail when SMTP authentication fails: Closes #6387
Closes #5990 Previews in attach dialog
Fallback to other SMTP authentication schemes: Closes #6091

This introduces an STMP authentication fallback scheme.  It first
attempts advertised schemes, then falls back to unadvertised (but
commonly-implemented) schemes.  In particular, this is to deal with
certain servers that advertise support for an authentication scheme
but not actually implement it.
Tab key inserts tab character in composer: Closes #7026

Different than general indentation or quoting, this gives the user
a little control over lining up text in the composer.
Merge branch 'master' into inlinecomp

Conflicts:
	src/client/composer/composer-window.vala
Improve UI updating

When we show or hide widgets while embeded, we need to trigger the
allocation process by hand, for some reason.  Also, we have to avoid
showing the toolbar buttons that may be hidden.
Only disconnect accelerators if they're connected