Re-establish selection after link dialog runs

Any selection made in the link dialog will destroy a selection in the
editor.  Previously, we corrected for this only when we had selected a
link, but we really need to do this every time.

https://bugzilla.gnome.org/show_bug.cgi?id=736689
Tighten up parent refs in ListParameters

While working on another bug, I discovered some issues with the
maintenance of parent references for IMAP Parameters being held in
ListParameters (of which every Parameter is held).  This patch not
only tightens up references, it also verifies references are accurate
when the ListParameter is destroyed.
Don't strip trailing space from signature separator

https://bugzilla.gnome.org/show_bug.cgi?id=736985
Update to 0.8.0
Add Czech help translation
Updated Spanish Translation
Updated German translation
Specify minimum gcr-3 requirement: Bug #737304

Earlier versions didn't include a VAPI.
Add gcr-3 version runtime requirement to debian/control: Bug #737304
Fix toolbar icon size in GTK+ 3.14: Bug #732065

By setting the icon pixel size, that forces GTK+ to load images
installed in our locations rather than the theme's.
Fix dtor names, empty if block

Latest build of Vala catches these.  if block is a logic change, but
harmless as (a) it fixes a bug that (b) is never exercised by the
application, as it does not logout of IMAP sessions.
Fix remaining icon issues with bug #732065

Archive button now loads and miscellaneous icons (including close icon
used in viewer pane) are scaled properly.

Spam icon remains too small under GTK+ 3.14.  That will be fixed with
bug #737862.
Don't show close/detach buttons twice under GTK+ 3.14: Bug #737860

Two sets of close/detach buttons are added to the inline composer to
place them according to theme layout.  For whatever reason, under
3.14 this call needs to be made when the widget is realized, whereas
before it was being called earlier.
Install Czech and French online help
Update to 0.8.1
Choose the message to reply to based on selection

If part of a message is selected, that will be the replied-to message.
If parts of multiple messages are selected, or nothing is selected, the
last email will be replied to.

https://bugzilla.gnome.org/show_bug.cgi?id=712912
Use selected text in quotes when available

https://bugzilla.gnome.org/show_bug.cgi?id=712912
Use bottom-posting when replying with selection

Forwarding always uses top-posting, since it makes it hard to
distinguish between the original mail and a bottom-posted reply.

https://bugzilla.gnome.org/show_bug.cgi?id=712912
Add selected text as quote in existing reply

This happens only if it's not changing the reply type.  This helps in
the case where you are switching the reply and haven't de-selected text
that was previously quoted.

https://bugzilla.gnome.org/show_bug.cgi?id=712912
Place cursor appropriately in new composer

When bottom posting, we need to place it between the quote and the
signature.  Rather than trying to smoosh guess about where it should go,
we mark the spot explicitly when adding (or not adding) the signature.

https://bugzilla.gnome.org/show_bug.cgi?id=712912