Rearrange include file contents into a saner order, add inclusion of <signal.h>.  Per Andrew Dunstan.
Rearrange include file contents into a saner order, add inclusion of
<signal.h>.  Per Andrew Dunstan.

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