Fix a bug in psql. unescape() does not work for multi-byte encodings.
Fix a bug in psql. unescape() does not work for multi-byte encodings.

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