* docs - enhance the pxf supported platforms section

* vendor -> bundle

* docs - update pxf supported platforms for v5.11

* combine 5.10 and 5.11 rows

* docs - update pxf supported platform table for v5.10.1

* consolidate the rows in the table

* combine 5.8.1 and 5.8.2

* docs - SERVER is required when accessing an object store

* fix formatting in new note

* docs - add pxf server cfg topic, rework other cfg topics, misc edits

* some of the edits requested by francisco

* add Hive back in to list of JDBC SQL dbs

* sneaking in a misc unrelated formatting fix

* edits requested by david

* docs - discuss pxf column projection

* add note about filter serialization

* column projection is always enabled

* edits requested by david

* docs - misc pxf edits

* add pxf to loading/unloading page and subnav

* edit requested by lav

* docs - reorg pxf content, add multi-server, objstore content

* misc edits, SERVER not optional

* add server, remove creds from examples

* address comments from alexd

* most edits requested by david

* add Minio to table column name

* edits from review with pxf team (start)

* clear text credentials, reorg objstore cfg page

* remove steps with XXX placeholder

* add MapR to supported hadoop distro list

* more objstore config updates

* address objstore comments from alex

* one parquet data type mapping table, misc edits

* misc edits from david

* add mapr hadoop config step, misc edits

* fix formatting

* clarify copying libs for MapR

* fix pxf links on CREATE EXTERNAL TABLE page

* misc edits

* mapr paths may differ based on version in use

* misc edits, use full topic name

* update OSS book for pxf subnav restructure

* docs - pxf no longer requires hadoop client install

* incorporate review comments, other simplifications

* unrelated - qualify filter pushdown data types and operators

* copy hadoop config to /etc/*/conf, bundled JARs used

* custom JARs

* misc edits from lav

* do not need to config hadoop if client installed

* remove private classpath from upgrade file list

* hbase prereq to copy pxf-hbase jar to hbase cluster nodes

* docs - add content for pxf writable profiles

* use consistent naming for PXF

* add writing to HDFS book subnav

* main pxf subnav title change

* edits from david

* use consistent terms when introducing pxf

* not writing is experimental

* style experimental warning on write page closer to rest of docs

* dir/file distinction, other edits from alex

* discuss distributed by

* rename read topic, more info to distributed by

* docs - integrate pxf markdown docs into gpdb dita

* incorporate initial review edits from david

* updates for david review (PART 2)

* incorporate comments from shivram

* hdfs/hive installcfg - copy cfg files from hdfs cluster

* update hadoop cluster dir for copy example, cfg chg note

* client inst/cfg - reiterate must be tarball in step