Pass all non-trivial data via stdin, not via argument

Passing via argument is bound to fail on quoting issues

src/jinja2/jat2rl.j2

@@ -4,7 +4,9 @@
 #######
 
 {% macro assert(A) -%}
-_distribution_jats__j2b_assert "{{A.verdict}}" "{{A.hint}}"
+_distribution_jats__j2b_assert "{{A.verdict}}" <<'EOD'
+{{A.hint}}
+EOD
 {% if A.data %}
 _distribution_jats__j2b_assert_data "{{A.verdict}}" <<'EOD'
 {{A.data}}
@@ -13,7 +15,9 @@ EOD
 {%- endmacro %}
 
 {% macro message(M) -%}
-_distribution_jats__j2b_message "{{M.severity}}" "{{M.message}}"
+_distribution_jats__j2b_message "{{M.severity}}" <<'EOD'
+{{M.message}}
+EOD
 {% if M.data %}
 _distribution_jats__j2b_message_data "{{M.severity}}" <<'EOD'
 {{M.data}}