[enter-data-helper/schema] Required fields bugs

[taudor]

When creating a new scheme the fields year and problem don't appear as required using enter-data-helper.
This seems to be a schema issue.

[dingens]

The schema requires that at least one of the years is specified (cause we assumed that every scheme is at least either a candidate or standardized).

It does not require any entries problems at all. Should it?

[taudor]

Weird, somehow I couldn't save without a problem. But now I can't replicate it, my fault.

As far as I know, public key algorithms always depend on some mathematical problem(s), so we could make this field mandatory.

[dingens]

As far as I know, public key algorithms always depend on some mathematical problem(s), so we could make this field mandatory.

I just noted that hash-based don't :) (in xmss, I've not listed the hash function properties seperately as (nearly?) every scheme implicitly assumes this)