Extend all 3 templates.
Skip AKID for self-signed certificates.
Visualize this by disabling the AKID checkbox
if a self-signed certificate is going to be created.
Translate the special text "DNS:copycn" in the SAN to
the final common name.
Add checkobox "Copy Common Name" to the SAN Edit box,
for a user-friendly editing of the "DNS:copycn"
During certificate creation, an empty common name together with
"DNS:copycn" in the SAN will raise a warning message and the
opportunity to change the settings.
Change the SAN in the HTTP-server XCA template from
"DNS:your.server.name.here" to "DNS:copycn" to already
take advantage of this feature in the default template.
