Sync release notes with CVS HEAD; various editorial improvements.
Sync release notes with CVS HEAD; various editorial improvements.

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