Update info about mailing lists, make a few other minor improvements.
Update info about mailing lists, make a few other minor improvements.

ovr/postgres-xl,CraigHarris/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,0x0FFF/gpdb,randomtask1155/gpdb,postmind-net/postgres-xl,lisakowen/gpdb,rubikloud/gpdb,jmcatamney/gpdb,zaksoup/gpdb,atris/gpdb,0x0FFF/gpdb,rvs/gpdb,adam8157/gpdb,oberstet/postgres-xl,tangp3/gpdb,rvs/gpdb,Postgres-XL/Postgres-XL,lpetrov-pivotal/gpdb,lpetrov-pivotal/gpdb,rubikloud/gpdb,zeroae/postgres-xl,techdragon/Postgres-XL,postmind-net/postgres-xl,yuanzhao/gpdb,jmcatamney/gpdb,janebeckman/gpdb,chrishajas/gpdb,adam8157/gpdb,ovr/postgres-xl,lintzc/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,rubikloud/gpdb,xuegang/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,xuegang/gpdb,chrishajas/gpdb,lisakowen/gpdb,rvs/gpdb,jmcatamney/gpdb,lpetrov-pivotal/gpdb,yuanzhao/gpdb,janebeckman/gpdb,lpetrov-pivotal/gpdb,lisakowen/gpdb,ashwinstar/gpdb,rvs/gpdb,jmcatamney/gpdb,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,tangp3/gpdb,arcivanov/postgres-xl,atris/gpdb,xuegang/gpdb,ahachete/gpdb,Quikling/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,yazun/postgres-xl,rubikloud/gpdb,randomtask1155/gpdb,postmind-net/postgres-xl,jmcatamney/gpdb,randomtask1155/gpdb,zeroae/postgres-xl,ashwinstar/gpdb,chrishajas/gpdb,atris/gpdb,ahachete/gpdb,xinzweb/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,techdragon/Postgres-XL,yazun/postgres-xl,janebeckman/gpdb,xuegang/gpdb,oberstet/postgres-xl,lintzc/gpdb,snaga/postgres-xl,chrishajas/gpdb,lintzc/gpdb,atris/gpdb,50wu/gpdb,kmjungersen/PostgresXL,0x0FFF/gpdb,foyzur/gpdb,edespino/gpdb,yuanzhao/gpdb,kmjungersen/PostgresXL,ashwinstar/gpdb,CraigHarris/gpdb,zaksoup/gpdb,ovr/postgres-xl,randomtask1155/gpdb,foyzur/gpdb,royc1/gpdb,kaknikhil/gpdb,yazun/postgres-xl,oberstet/postgres-xl,CraigHarris/gpdb,Chibin/gpdb,Chibin/gpdb,ashwinstar/gpdb,rvs/gpdb,Quikling/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,janebeckman/gpdb,tangp3/gpdb,lpetrov-pivotal/gpdb,zeroae/postgres-xl,foyzur/gpdb,kaknikhil/gpdb,foyzur/gpdb,CraigHarris/gpdb,oberstet/postgres-xl,ashwinstar/gpdb,ashwinstar/gpdb,0x0FFF/gpdb,Quikling/gpdb,greenplum-db/gpdb,yazun/postgres-xl,snaga/postgres-xl,xuegang/gpdb,lpetrov-pivotal/gpdb,rubikloud/gpdb,arcivanov/postgres-xl,cjcjameson/gpdb,kmjungersen/PostgresXL,rvs/gpdb,janebeckman/gpdb,yuanzhao/gpdb,tpostgres-projects/tPostgres,Quikling/gpdb,royc1/gpdb,cjcjameson/gpdb,atris/gpdb,tangp3/gpdb,Quikling/gpdb,greenplum-db/gpdb,edespino/gpdb,edespino/gpdb,royc1/gpdb,lintzc/gpdb,rvs/gpdb,lpetrov-pivotal/gpdb,tangp3/gpdb,50wu/gpdb,50wu/gpdb,yuanzhao/gpdb,lintzc/gpdb,CraigHarris/gpdb,tpostgres-projects/tPostgres,edespino/gpdb,50wu/gpdb,chrishajas/gpdb,oberstet/postgres-xl,chrishajas/gpdb,0x0FFF/gpdb,50wu/gpdb,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,xinzweb/gpdb,randomtask1155/gpdb,edespino/gpdb,adam8157/gpdb,zaksoup/gpdb,lisakowen/gpdb,Chibin/gpdb,CraigHarris/gpdb,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,lintzc/gpdb,edespino/gpdb,greenplum-db/gpdb,ovr/postgres-xl,edespino/gpdb,rubikloud/gpdb,janebeckman/gpdb,zaksoup/gpdb,chrishajas/gpdb,zeroae/postgres-xl,50wu/gpdb,kaknikhil/gpdb,ahachete/gpdb,lintzc/gpdb,foyzur/gpdb,tangp3/gpdb,kaknikhil/gpdb,royc1/gpdb,rubikloud/gpdb,ahachete/gpdb,kmjungersen/PostgresXL,snaga/postgres-xl,snaga/postgres-xl,greenplum-db/gpdb,greenplum-db/gpdb,janebeckman/gpdb,janebeckman/gpdb,Chibin/gpdb,jmcatamney/gpdb,randomtask1155/gpdb,snaga/postgres-xl,Quikling/gpdb,postmind-net/postgres-xl,xinzweb/gpdb,cjcjameson/gpdb,Quikling/gpdb,Chibin/gpdb,cjcjameson/gpdb,Chibin/gpdb,xuegang/gpdb,cjcjameson/gpdb,pavanvd/postgres-xl,xinzweb/gpdb,kmjungersen/PostgresXL,techdragon/Postgres-XL,arcivanov/postgres-xl,tangp3/gpdb,Chibin/gpdb,atris/gpdb,yuanzhao/gpdb,pavanvd/postgres-xl,zaksoup/gpdb,Chibin/gpdb,lisakowen/gpdb,50wu/gpdb,tangp3/gpdb,foyzur/gpdb,chrishajas/gpdb,rvs/gpdb,50wu/gpdb,ovr/postgres-xl,lintzc/gpdb,rvs/gpdb,rvs/gpdb,zeroae/postgres-xl,kaknikhil/gpdb,adam8157/gpdb,adam8157/gpdb,edespino/gpdb,pavanvd/postgres-xl,cjcjameson/gpdb,xuegang/gpdb,royc1/gpdb,greenplum-db/gpdb,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,cjcjameson/gpdb,lpetrov-pivotal/gpdb,Chibin/gpdb,Quikling/gpdb,techdragon/Postgres-XL,cjcjameson/gpdb,janebeckman/gpdb,kaknikhil/gpdb,randomtask1155/gpdb,lisakowen/gpdb,rubikloud/gpdb,xinzweb/gpdb,yazun/postgres-xl,royc1/gpdb,atris/gpdb,ahachete/gpdb,jmcatamney/gpdb,zaksoup/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,ahachete/gpdb,CraigHarris/gpdb,tpostgres-projects/tPostgres,ahachete/gpdb,ahachete/gpdb,yuanzhao/gpdb,xuegang/gpdb,xinzweb/gpdb,CraigHarris/gpdb,lintzc/gpdb,janebeckman/gpdb,edespino/gpdb,xinzweb/gpdb,tpostgres-projects/tPostgres,cjcjameson/gpdb,xuegang/gpdb,Quikling/gpdb,ashwinstar/gpdb,adam8157/gpdb,edespino/gpdb,adam8157/gpdb,0x0FFF/gpdb,xinzweb/gpdb,adam8157/gpdb,lisakowen/gpdb,randomtask1155/gpdb,0x0FFF/gpdb,royc1/gpdb,atris/gpdb,Quikling/gpdb,Chibin/gpdb,foyzur/gpdb,foyzur/gpdb,royc1/gpdb,zaksoup/gpdb,zaksoup/gpdb