[geary] (14 commits) ...Merge branch 'wip/713006-better-error-reporting'. Fixes Bug 713006.

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  80680f2... Add initial support for using Gtk.InfoBars to display error (*)
  403a99f... Make account-related implementation debugging ids a bit mor (*)
  7310e09... Push IMAP auth handling down the stack, try 3 times before  (*)
  c27ad28... Handle incoming connection failures in the same way as for  (*)
  5382752... Clean up SmtpOutboxFolder error handling further. (*)
  9733210... Implement retry for send and receive errors. (*)
  733def6... Report IMAP connection errors, don't endlessly retry to con (*)
  5520c10... Allow passing addtional information when reporting engine e (*)
  36092d4... Add doc comments for Geary.SmtpError. (*)
  0d1efc2... Use the ConnectivityManager to detect connection problems u (*)
  bcca75f... Include a back trace in problem report technical details. (*)
  e0ba271... Minor code cleanup. (*)
  8c2a4fc... Add licensing info for libunwind binding, based on conventi (*)
  d1d8d64... Merge branch 'wip/713006-better-error-reporting'. Fixes Bug

(*) This commit already existed in another branch; no separate mail sent