New policy update and control tuning (1.0.4-2)

* Remove no more needed 'DM-Upload-Alllowed' and 'Uploaders'
* Update Standards-Version
* Adopt to the new policy:
  - Conflicts of old emacsen-common, Depends of the new.
  - add emacsen-compat
  debhelper takes care of the rest of the job.

Signed-off-by: Yauheni Kaliuta <y.kaliuta@gmail.com>