[PATCH v3 0/3] emacs: do not call notmuch show for non-inlinable parts

[Dmitry Kurochkin]

Make some changes suggested by Tomi Ollila [1].

Changes:

v3 since v2:

* Use read function instead of cat(1) to read counter value.
* Add a newline after the count value in state file and
  notmuch_counter_value() output.

v2 since v1:

* Rename $notmuch_counter variable to $notmuch_counter_command.
* Rename notmuch_counter() function to notmuch_counter_value().
* Fix documentation for notmuch_counter_value().
* Removed unneeded and add missing "|| return" in notmuch_counter_reset().
* Coding style fixes.

[1] id:"yf6aa7gj7w5.fsf at taco2.nixu.fi"