Add R_PLANS to psql help,  and SET cleanup.
Add R_PLANS to psql help,  and SET cleanup.

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