Remove installation mention that integer timestamps is less stable that floating point.
Remove installation mention that integer timestamps is less stable that
floating point.

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