pgsql: pg_dump: Reduce use of global variables

pg_dump: Reduce use of global variables

Most pg_dump.c global variables, which were passed down individually to
dumping routines, are now grouped as members of the new DumpOptions
struct, which is used as a local variable and passed down into routines
that need it.  This helps future development efforts; in particular it
is said to enable a mode in which a parallel pg_dump run can output
multiple streams, and have them restored in parallel.

Also take the opportunity to clean up the pg_dump header files somewhat,
to avoid circularity.

Author: Joachim Wieland, revised by Álvaro Herrera
Reviewed by Peter Eisentraut

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/0eea8047bf0e15b402b951e383e39236bdfe57d5

Modified Files
--------------
src/bin/pg_dump/common.c              |   27 +-
src/bin/pg_dump/compress_io.c         |    3 +-
src/bin/pg_dump/compress_io.h         |    1 -
src/bin/pg_dump/dumputils.h           |   19 +-
src/bin/pg_dump/parallel.c            |   18 +-
src/bin/pg_dump/parallel.h            |   30 +-
src/bin/pg_dump/pg_backup.h           |  110 ++++-
src/bin/pg_dump/pg_backup_archiver.c  |   91 +++-
src/bin/pg_dump/pg_backup_archiver.h  |   83 ++--
src/bin/pg_dump/pg_backup_custom.c    |    9 +-
src/bin/pg_dump/pg_backup_db.c        |   25 +-
src/bin/pg_dump/pg_backup_db.h        |   11 +-
src/bin/pg_dump/pg_backup_directory.c |   17 +-
src/bin/pg_dump/pg_backup_null.c      |   14 +-
src/bin/pg_dump/pg_backup_tar.c       |    9 +-
src/bin/pg_dump/pg_backup_utils.c     |    1 -
src/bin/pg_dump/pg_backup_utils.h     |    4 +
src/bin/pg_dump/pg_dump.c             |  873 ++++++++++++++++-----------------
src/bin/pg_dump/pg_dump.h             |   77 +--
src/bin/pg_dump/pg_dump_sort.c        |    4 +-
src/bin/pg_dump/pg_dumpall.c          |    6 +-
src/bin/pg_dump/pg_restore.c          |    9 +-
22 files changed, 762 insertions(+), 679 deletions(-)