Remove PL/perl language chapter, since it shows up in the User's Guide.
Remove PL/perl language chapter, since it shows up in the User's Guide.

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