Update README with proposed new method for determining calling convention of user-defined functions (forget 'C' vs 'newC', instead require an info function to be present for new-style functions).  Also update some other out-of-date commentary.
Update README with proposed new method for determining calling convention
of user-defined functions (forget 'C' vs 'newC', instead require an info
function to be present for new-style functions).  Also update some other
out-of-date commentary.

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