pgsql: Marginal cleanup of GROUPING SETS code in grouping_planner().

Marginal cleanup of GROUPING SETS code in grouping_planner().

Improve comments and make it a shade less messy. I think we might want
to move all of this somewhere else later, but it needs to be more
readable first.

In passing, re-pgindent the file, affecting some recently-added comments
concerning parallel query planning.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/a54676acadcf811f6945db15e81651df96beabc4

Modified Files
--------------
src/backend/optimizer/plan/planner.c | 93 +++++++++++++++++++++-------------
1 file changed, 57 insertions(+), 36 deletions(-)

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