Re: Proposal: knowing detail of config files via SQL

The following review has been posted through the commitfest application:
make installcheck-world:  tested, failed
Implements feature:       tested, passed
Spec compliant:           tested, passed
Documentation:            tested, passed

Looks good overall, but make installcheck-world does not pass.  rules.sql outputs all system views to pg_file_settings
willneed to be added:
 

*** src/src/test/regress/expected/rules.out    2015-04-24 12:11:15.000000000 -0400
--- src/src/test/regress/results/rules.out    2015-04-28 10:44:59.000000000 -0400
***************
*** 1308,1313 ****
--- 1308,1319 ----     c.is_scrollable,     c.creation_time    FROM pg_cursor() c(name, statement, is_holdable,
is_binary,is_scrollable, creation_time);
 
+ pg_file_settings| SELECT a.sourcefile,
+     a.sourceline,
+     a.seqno,
+     a.name,
+     a.setting
+    FROM pg_show_all_file_settings() a(sourcefile, sourceline, seqno, name, setting); pg_group| SELECT
pg_authid.rolnameAS groname,     pg_authid.oid AS grosysid,     ARRAY( SELECT pg_auth_members.member