PR 2501 "Support for SPARQL CDTs (lists and maps as literals)"

[Andy Seaborne]

We have received a significant PR:

"Support for SPARQL CDTs (lists and maps as literals)"
https://github.com/apache/jena/pull/2501
from Olaf Hartig.

It is not a purely personal contribution and it looks like it should 
have a Software Grant for the specific contribnution as well as a 
general ICLA from Olaf.

    Andy