Fix #338 by using “long” contact addresses as the actual field values mu4e~view-construct-contacts-header.
Merge https://github.com/akopytov/mu
Verify that mu4e-split-view is used
Quit in a way similar to help buffers'
Merge pull request #356 from sabof/no-split-mark-fix

* fix for marking without mu4e-split-view
Use window-deletable-p
Merge pull request #358 from sabof/delete-window-on-quit

* mu4e: quit in a way similar to help buffers'
Merge pull request #357 from sabof/more-accurate-deletion-test

* prevent occasional errors when windows are deleted
Merge pull request #339 from akopytov/master

* mu4e: Fix for #338.