We want to:
* model the CSR after the OPenPGP key creation dialog, show only name and email, hide all other fields behind "advanced settings"
* order of advanced settings: algorithm, usage, L, OU, O, C, additional mail addresses, DNS names, URIs
* use simple multi line text inputs for the last 3 items
* show a Save File dialog after successful creation of the CSR instead of the result dialog.
This is the S/MIME counterpart of {T5832}.