Fix #338 by using “long” contact addresses as the actual field values mu4e~view-construct-contacts-header.
Merge https://github.com/akopytov/mu
Better `M-<` and `M->` when composing a message.

This commit provides the following 2 functions that help the user go to
interesting positions at the beginning and end of the message being
composed. These 2 functions are bound to the standard `M-<` and `M->`
keys (or more precisely, to the keys where 'beginning-of-buffer and
'end-of-buffer are bound).

mu4e-compose-goto-top: Go to the beginning of the message or buffer.
  Go to the beginning of the message or, if already there, go to the
  beginning of the buffer.

mu4e-compose-goto-bottom Go to the end of the message or buffer.
  Go to the end of the message (before signature) or, if already there,
  go to the end of the buffer.
Use message-signature-separator
removed 'nocolor' option. Added 'color' option that takes (auto|never|always) instead.
Merge pull request #345 from DamienCassou/goto-begin-end-of-message

* better `M-<` and `M->` when composing a message.
* mu4e: fix regexp
* mu4e: small update in doc
* mu4e-main: fix the main menu regexps
* tweak
* fix typo
main man page updated
'color' variable no longer used. Default color value is 'always'.
color var removed entirely
fix main search shortcut typo
Merge pull request #354 from aecepoglu/master

* removed 'nocolor' option. Added 'color' option
Merge pull request #355 from jschwab/master

* fix main search shortcut typo
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