Revive line type

Peter Eisentraut <peter_e@gmx.net>

Commit: 261c7d4b653bc3e44c31fd456d94f292caa50d8f
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2013-10-10T02:34:38Z
Releases: 9.4.0
Revive line type

Change the input/output format to {A,B,C}, to match the internal
representation.

Complete the implementations of line_in, line_out, line_recv, line_send.
Remove comments and error messages about the line type not being
implemented.  Add regression tests for existing line operators and
functions.

Reviewed-by: rui hua <365507506hua@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@2ndquadrant.com>
Reviewed-by: Jeevan Chalke <jeevan.chalke@enterprisedb.com>

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