Split tuple struct defs from htup.h to htup_details.h

This reduces unnecessary exposure of other headers through htup.h, which
is very widely included by many files.

I have chosen to move the function prototypes to the new file as well,
because that means htup.h no longer needs to include tupdesc.h.  In
itself this doesn't have much effect in indirect inclusion of tupdesc.h
throughout the tree, because it's also required by execnodes.h; but it's
something to explore in the future, and it seemed best to do the htup.h
change now while I'm busy with it.

src/backend/commands/aggregatecmds.c

@@ -23,6 +23,7 @@
 #include "postgres.h"
 
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"
 #include "catalog/pg_aggregate.h"

src/backend/commands/alter.c

@@ -14,6 +14,7 @@
  */
 #include "postgres.h"
 
+#include "access/htup_details.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"
 #include "catalog/namespace.h"

src/backend/commands/collationcmds.c

@@ -15,6 +15,7 @@
 #include "postgres.h"
 
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"

src/backend/commands/comment.c

@@ -16,6 +16,7 @@
 
 #include "access/genam.h"
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "catalog/indexing.h"
 #include "catalog/objectaddress.h"
 #include "catalog/pg_description.h"

src/backend/commands/conversioncmds.c

@@ -15,6 +15,7 @@
 #include "postgres.h"
 
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"
 #include "catalog/pg_conversion.h"

src/backend/commands/copy.c

@@ -21,6 +21,7 @@
 #include <arpa/inet.h>
 
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/sysattr.h"
 #include "access/xact.h"
 #include "catalog/namespace.h"

src/backend/commands/createas.c

@@ -22,6 +22,7 @@
 #include "postgres.h"
 
 #include "access/reloptions.h"
+#include "access/htup_details.h"
 #include "access/sysattr.h"
 #include "access/xact.h"
 #include "catalog/toasting.h"

src/backend/commands/dbcommands.c

@@ -26,6 +26,7 @@
 
 #include "access/genam.h"
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "access/xlogutils.h"
 #include "catalog/catalog.h"

src/backend/commands/dropcmds.c

@@ -16,6 +16,7 @@
 #include "postgres.h"
 
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "catalog/dependency.h"
 #include "catalog/namespace.h"
 #include "catalog/objectaddress.h"

src/backend/commands/event_trigger.c

@@ -13,6 +13,7 @@
  */
 #include "postgres.h"
 
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"

src/backend/commands/extension.c

@@ -27,6 +27,7 @@
 #include <limits.h>
 #include <unistd.h>
 
+#include "access/htup_details.h"
 #include "access/sysattr.h"
 #include "access/xact.h"
 #include "catalog/dependency.h"

src/backend/commands/foreigncmds.c

@@ -14,6 +14,7 @@
 #include "postgres.h"
 
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "access/reloptions.h"
 #include "catalog/dependency.h"

src/backend/commands/functioncmds.c

@@ -34,6 +34,7 @@
 
 #include "access/genam.h"
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/sysattr.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"

src/backend/commands/indexcmds.c

@@ -15,6 +15,7 @@
 
 #include "postgres.h"
 
+#include "access/htup_details.h"
 #include "access/reloptions.h"
 #include "access/xact.h"
 #include "catalog/catalog.h"

src/backend/commands/opclasscmds.c

@@ -20,6 +20,7 @@
 #include "access/genam.h"
 #include "access/heapam.h"
 #include "access/nbtree.h"
+#include "access/htup_details.h"
 #include "access/sysattr.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"

src/backend/commands/operatorcmds.c

@@ -35,6 +35,7 @@
 #include "postgres.h"
 
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"
 #include "catalog/pg_operator.h"

src/backend/commands/proclang.c

@@ -15,6 +15,7 @@
 
 #include "access/genam.h"
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"
 #include "catalog/objectaccess.h"

src/backend/commands/schemacmds.c

@@ -14,6 +14,7 @@
  */
 #include "postgres.h"
 
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "catalog/catalog.h"
 #include "catalog/dependency.h"

src/backend/commands/seclabel.c

@@ -12,6 +12,7 @@
 
 #include "access/genam.h"
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "catalog/catalog.h"
 #include "catalog/indexing.h"
 #include "catalog/pg_seclabel.h"

src/backend/commands/sequence.c

@@ -15,6 +15,7 @@
 #include "postgres.h"
 
 #include "access/transam.h"
+#include "access/htup_details.h"
 #include "access/xlogutils.h"
 #include "catalog/dependency.h"
 #include "catalog/namespace.h"

src/backend/commands/tablespace.c

@@ -53,6 +53,7 @@
 
 #include "access/heapam.h"
 #include "access/reloptions.h"
+#include "access/htup_details.h"
 #include "access/sysattr.h"
 #include "access/xact.h"
 #include "catalog/catalog.h"

src/backend/commands/trigger.c

@@ -16,6 +16,7 @@
 #include "access/genam.h"
 #include "access/heapam.h"
 #include "access/sysattr.h"
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "catalog/catalog.h"
 #include "catalog/dependency.h"

src/backend/commands/tsearchcmds.c

@@ -17,8 +17,9 @@
 
 #include <ctype.h>
 
-#include "access/heapam.h"
 #include "access/genam.h"
+#include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"

src/backend/commands/typecmds.c

@@ -33,6 +33,7 @@
 
 #include "access/genam.h"
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "catalog/catalog.h"
 #include "catalog/dependency.h"

src/backend/commands/user.c

@@ -14,6 +14,7 @@
 
 #include "access/genam.h"
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"

src/backend/commands/vacuum.c

@@ -25,6 +25,7 @@
 #include "access/clog.h"
 #include "access/genam.h"
 #include "access/heapam.h"
+#include "access/htup_details.h"
 #include "access/transam.h"
 #include "access/xact.h"
 #include "catalog/namespace.h"

src/backend/commands/vacuumlazy.c

@@ -40,6 +40,7 @@
 #include "access/genam.h"
 #include "access/heapam.h"
 #include "access/heapam_xlog.h"
+#include "access/htup_details.h"
 #include "access/transam.h"
 #include "access/visibilitymap.h"
 #include "catalog/storage.h"

src/backend/commands/variable.c

@@ -18,6 +18,7 @@
 
 #include <ctype.h>
 
+#include "access/htup_details.h"
 #include "access/xact.h"
 #include "catalog/pg_authid.h"
 #include "commands/variable.h"