More polish for documentation
Better wording of what the operators are
Remove bulk of observations on jsonb from notes section
Document various operator classes
Merge branch 'jsonb-test-fixes' into jsonb_and_hstore

Adds some regression tests previously in hstore2 to core's jsonb
datatype.
Fix hash gin opclass in tests
Minor style tweaks
Whitespace
Fix broken GiST compression

Forgot to detoast ghstore value during compression.
Regression test whitespace
Remove ill-considered @ operator
Consistently use new 'object' nomenclature for associative structure
Fix jsonb_exists_all
pgindent run on new core files
Indentation fixes
@> operator tests