Log Message:
Updated claws-mail and all of its plug-ins to 3.7.0

* 3.7.0
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* Expanding/Collapsing of threads is now approximately 95% faster.

* Cache reading is now approximately 10% faster.

* The shortcut key settings of the main window and the message list
  context menus are now connected.

* The preferences on the 'Other' page have now been moved to
  Other/Miscellaneous. The parent pages are now unselectable and the
  first page is automatically selected on opening the preferences.

* In the Compose window, on the Others tab, the 'Save message to'
  entry now has a drop-down list of the previous save locations.

*  In the Compose window, the Attachments Properties window is now
   confirmed and closed with the Return key.

* When using an external editor to compose messages, the message is
  automatically saved to Drafts when the external editor is closed.

* A hidden option has been added, 'primary_paste_unselects' which
  causes the primary buffer to be cleared and the insertion point to
  be repositioned when the middle mouse button is used for pasting
  text. It is turned off by default.

* In the Actions window, the Escape key now cancels the action
  editing.

* Offline SSL certificate verification has been added.

* Privacy plugins: The decryption failure messages are now shown
  in the NoticeView just above the message text rather than in a
  popup window.

* Privacy plugins: when listing the UIDs during a signature check,
  show the UID validity

* tools/popfile-link.sh
  Support for reusing existing POPFile session ID has been added.

* tools/kdeservicemenu
  Support for kde4 has been added.

* win32: better integration has been implemented by using the
  standard file associations.