request to LSB: make 0 BFC CERTIFY mandatory

[Steffen]

We have reached a new quality level of our parts library:
* EVERY official part is now BFC certified.
* there are NO unofficial parts on the PT which are not BFC certified

Here is the proof:
https://www.ldraw.org/cgi-bin/ptbfcstatus.cgi

This is another great milestone in the quality of our parts.

To keep this situation,
I would like to suggest to adjust the PT now to require that an uploaded file carries the statement
0 BFC CERTIFY
in its header, and to reject submittal otherwise.