pgsql: Add pg_recvlogical, a tool to receive data logical decoding data

Add pg_recvlogical, a tool to receive data logical decoding data.

This is fairly basic at the moment, but it's at least useful for
testing and debugging, and possibly more.

Andres Freund

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/8bdd12bbf093c846c9383c205e363d6ae35f11a6

Modified Files
--------------
src/bin/pg_basebackup/.gitignore       |    1 +
src/bin/pg_basebackup/Makefile         |   11 +-
src/bin/pg_basebackup/nls.mk           |    2 +-
src/bin/pg_basebackup/pg_recvlogical.c |  978 ++++++++++++++++++++++++++++++++
src/bin/pg_basebackup/receivelog.c     |  137 +----
src/bin/pg_basebackup/receivelog.h     |    2 +
src/bin/pg_basebackup/streamutil.c     |  119 +++-
src/bin/pg_basebackup/streamutil.h     |   10 +
8 files changed, 1135 insertions(+), 125 deletions(-)