Merge pull request #114 in ZP/z-push from bugfix/ZP-799-disallow-new-new-time-proposal-is to develop

* commit '63c9431e':
  ZP-799 Fix bug DisallowNewTimeProposal is AS14 and later feature. Released under the Affero GNU General Public License (AGPL) version 3.

(cherry picked from commit 6a1891a9)