The ``{{::DEL::}}`` is not subject to interpolation any more. This fixes the handling of these deletion markers when merging configurations: sometimes they were tried to be interpolated -- and this failed.

# -*- coding: utf-8 -*-

tmpdir = '{{_tmpdir}}\4'

[db.user]
name = "the_database_user_2"
__doc2 = "Overwriting a comment"
pwd="the-database-password-2"

[db.locinfo.ro]
hostname = "3rd-host"