New release on http://fex.belwue.de/fex.html

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)

- fixed various bugs