  * Check sense of magic value QSharedMemory in <src/sakia/helpers.py>.
  * Check sense of magic value MERKLE_EMPTY_ROOT in <src/sakia/data/entities/node.py>.
  * Check use of http (not https) esp. hardcoded in e.g. <src/sakia/data/entities/user_parameters.py>.
  * Recommend explicit copyright and licensing header in each code file.
  * Recommend PGP-signed releases.
  * Recommend proof-reading of Ǧ1 license.
  * check testsuite when needed python modules are in Debian:
    + duniter-mirage
