Draft release notes for 9.3.2.
Draft release notes for 9.3.2.

I'm putting these up for review before I start to extract the relevant
subsets for the older branches.  It'll be easier to make any suggested
wording improvements at this stage.

ashwinstar/gpdb,jmcatamney/gpdb,ovr/postgres-xl,lisakowen/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,adam8157/gpdb,oberstet/postgres-xl,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,lisakowen/gpdb,ovr/postgres-xl,pavanvd/postgres-xl,ashwinstar/gpdb,greenplum-db/gpdb,yazun/postgres-xl,lisakowen/gpdb,greenplum-db/gpdb,50wu/gpdb,techdragon/Postgres-XL,ovr/postgres-xl,xinzweb/gpdb,adam8157/gpdb,techdragon/Postgres-XL,ovr/postgres-xl,zeroae/postgres-xl,greenplum-db/gpdb,techdragon/Postgres-XL,adam8157/gpdb,jmcatamney/gpdb,50wu/gpdb,greenplum-db/gpdb,lisakowen/gpdb,xinzweb/gpdb,yazun/postgres-xl,ashwinstar/gpdb,adam8157/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,adam8157/gpdb,yazun/postgres-xl,Postgres-XL/Postgres-XL,50wu/gpdb,xinzweb/gpdb,ashwinstar/gpdb,yazun/postgres-xl,jmcatamney/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,techdragon/Postgres-XL,yazun/postgres-xl,oberstet/postgres-xl,50wu/gpdb,zeroae/postgres-xl,jmcatamney/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,greenplum-db/gpdb,xinzweb/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,lisakowen/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,zeroae/postgres-xl,lisakowen/gpdb,50wu/gpdb,50wu/gpdb,ovr/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,50wu/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,pavanvd/postgres-xl,zeroae/postgres-xl,lisakowen/gpdb,adam8157/gpdb,adam8157/gpdb,ashwinstar/gpdb,xinzweb/gpdb,lisakowen/gpdb,jmcatamney/gpdb