pgsql: Add pg_rewind, for re-synchronizing a master server after failba

Add pg_rewind, for re-synchronizing a master server after failback.

Earlier versions of this tool were available (and still are) on github.

Thanks to Michael Paquier, Alvaro Herrera, Peter Eisentraut, Amit Kapila,
and Satoshi Nagayasu for review.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/61081e75c6741024f7717ade0450090590e96c85

Modified Files
--------------
doc/src/sgml/high-availability.sgml   |    4 +-
doc/src/sgml/ref/allfiles.sgml        |    1 +
doc/src/sgml/ref/pg_rewind.sgml       |  237 ++++++++++++
doc/src/sgml/reference.sgml           |    1 +
src/bin/Makefile                      |    1 +
src/bin/pg_rewind/.gitignore          |    7 +
src/bin/pg_rewind/Makefile            |   52 +++
src/bin/pg_rewind/RewindTest.pm       |  271 ++++++++++++++
src/bin/pg_rewind/copy_fetch.c        |  261 +++++++++++++
src/bin/pg_rewind/datapagemap.c       |  126 +++++++
src/bin/pg_rewind/datapagemap.h       |   32 ++
src/bin/pg_rewind/fetch.c             |   61 +++
src/bin/pg_rewind/fetch.h             |   46 +++
src/bin/pg_rewind/file_ops.c          |  305 +++++++++++++++
src/bin/pg_rewind/file_ops.h          |   24 ++
src/bin/pg_rewind/filemap.c           |  667 +++++++++++++++++++++++++++++++++
src/bin/pg_rewind/filemap.h           |  108 ++++++
src/bin/pg_rewind/libpq_fetch.c       |  464 +++++++++++++++++++++++
src/bin/pg_rewind/logging.c           |  140 +++++++
src/bin/pg_rewind/logging.h           |   37 ++
src/bin/pg_rewind/nls.mk              |    9 +
src/bin/pg_rewind/parsexlog.c         |  374 ++++++++++++++++++
src/bin/pg_rewind/pg_rewind.c         |  550 +++++++++++++++++++++++++++
src/bin/pg_rewind/pg_rewind.h         |   44 +++
src/bin/pg_rewind/t/001_basic.pl      |   80 ++++
src/bin/pg_rewind/t/002_databases.pl  |   41 ++
src/bin/pg_rewind/t/003_extrafiles.pl |   61 +++
src/bin/pg_rewind/timeline.c          |  131 +++++++
src/tools/msvc/Mkvcbuild.pm           |    8 +-
29 files changed, 4141 insertions(+), 2 deletions(-)