Update URL to Ross Williams' CRC paper.
Update URL to Ross Williams' CRC paper.

Per note from Devrim Gunduz

zeroae/postgres-xl,snaga/postgres-xl,snaga/postgres-xl,kmjungersen/PostgresXL,arcivanov/postgres-xl,Postgres-XL/Postgres-XL,50wu/gpdb,adam8157/gpdb,yuanzhao/gpdb,50wu/gpdb,oberstet/postgres-xl,lisakowen/gpdb,greenplum-db/gpdb,oberstet/postgres-xl,Chibin/gpdb,pavanvd/postgres-xl,yazun/postgres-xl,postmind-net/postgres-xl,ovr/postgres-xl,jmcatamney/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,Chibin/gpdb,tpostgres-projects/tPostgres,jmcatamney/gpdb,Postgres-XL/Postgres-XL,tpostgres-projects/tPostgres,50wu/gpdb,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,xinzweb/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,arcivanov/postgres-xl,ashwinstar/gpdb,pavanvd/postgres-xl,Chibin/gpdb,Chibin/gpdb,50wu/gpdb,postmind-net/postgres-xl,pavanvd/postgres-xl,greenplum-db/gpdb,yuanzhao/gpdb,kmjungersen/PostgresXL,xinzweb/gpdb,edespino/gpdb,snaga/postgres-xl,adam8157/gpdb,yazun/postgres-xl,ashwinstar/gpdb,adam8157/gpdb,50wu/gpdb,jmcatamney/gpdb,xinzweb/gpdb,ovr/postgres-xl,yuanzhao/gpdb,lisakowen/gpdb,50wu/gpdb,zeroae/postgres-xl,50wu/gpdb,techdragon/Postgres-XL,kmjungersen/PostgresXL,yazun/postgres-xl,Chibin/gpdb,ashwinstar/gpdb,adam8157/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,edespino/gpdb,snaga/postgres-xl,ashwinstar/gpdb,edespino/gpdb,arcivanov/postgres-xl,ashwinstar/gpdb,xinzweb/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,lisakowen/gpdb,lisakowen/gpdb,xinzweb/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,postmind-net/postgres-xl,edespino/gpdb,50wu/gpdb,greenplum-db/gpdb,oberstet/postgres-xl,adam8157/gpdb,adam8157/gpdb,techdragon/Postgres-XL,Chibin/gpdb,edespino/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,postmind-net/postgres-xl,arcivanov/postgres-xl,ashwinstar/gpdb,xinzweb/gpdb,yazun/postgres-xl,edespino/gpdb,xinzweb/gpdb,Chibin/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,adam8157/gpdb,lisakowen/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,ovr/postgres-xl,oberstet/postgres-xl,lisakowen/gpdb,greenplum-db/gpdb,kmjungersen/PostgresXL,pavanvd/postgres-xl,yuanzhao/gpdb,Chibin/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,pavanvd/postgres-xl,jmcatamney/gpdb,postmind-net/postgres-xl,oberstet/postgres-xl,greenplum-db/gpdb,Chibin/gpdb,lisakowen/gpdb,ashwinstar/gpdb,xinzweb/gpdb,arcivanov/postgres-xl,edespino/gpdb,snaga/postgres-xl,kmjungersen/PostgresXL,techdragon/Postgres-XL,yazun/postgres-xl,Chibin/gpdb,edespino/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,edespino/gpdb,ovr/postgres-xl,greenplum-db/gpdb,edespino/gpdb,yuanzhao/gpdb,lisakowen/gpdb,jmcatamney/gpdb