add certificate Sub-Command

add certificate "name_CERTIFICATE" SINGLE NSID # MKID "#"

add certificate "name_CERTIFICATE" GROUP "name_CERTIFICATE" ...

For GROUP certificates, a space-separated list of "name_CERTIFICATE" entries follows the GROUP keyword.

The following fields are optional for SINGLE entries and may be specified in any order after the "certificate" keyword:

G #

P #

KEY_LENGTH #

LOCAL "name_SCREEN"

The following fields are optional and can be specified in any order after the "certificate" keyword:

SCREEN "name_SCREEN"

COMMENT "comment string"