Large C files

FYI, here are all the C files with over 6k lines:

-  45133 ./interfaces/ecpg/preproc/preproc.c
-  33651 ./backend/parser/gram.c
-  17551 ./backend/parser/scan.c  14209 ./bin/pg_dump/pg_dump.c  10590 ./backend/access/transam/xlog.c   9764
./backend/commands/tablecmds.c  8681 ./backend/utils/misc/guc.c
 
-   7667 ./bin/psql/psqlscan.c   7213 ./backend/utils/adt/ruleutils.c   6814 ./backend/utils/adt/selfuncs.c   6176
./backend/utils/adt/numeric.c  6030 ./pl/plpgsql/src/pl_exec.c
 

I have dash-marked the files that are computer-generated.  It seems
pg_dump.c and xlog.c should be split into smaller C files.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + It's impossible for everything to be true. +