LispUnion routine didn't generate a proper union: anytime l2 contained more than one entry, there would be duplicates in the output list.  Miscellaneous code beautification in other routines, too.
LispUnion routine didn't generate a proper union: anytime
l2 contained more than one entry, there would be duplicates in the output
list.  Miscellaneous code beautification in other routines, too.

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