Important changes:
-- recipient address can have attached :options (keep,autodelete,locale)
-
-- added config variable @extra_header with default HTTP security headers,
- see: https://securityheaders.io/?q=http%3A%2F%2Ffex.belwue.de
-
-- dynamic HTML runs in own Perl namespace (DOP)
+- new fex.ph config variable $purge
- fixed various bugs