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 <[email protected]>
Reviewed-by: Álvaro Herrera <[email protected]>
Reviewed-by: Jeevan Chalke <[email protected]>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/261c7d4b653bc3e44c31fd456d94f292caa50d8f

Modified Files
--------------
doc/src/sgml/datatype.sgml                 |   42 ++++-
doc/src/sgml/func.sgml                     |    6 +
src/backend/utils/adt/geo_ops.c            |  224 ++++++++++-------------
src/include/catalog/pg_type.h              |    3 +-
src/include/utils/geo_decls.h              |    7 -
src/test/regress/expected/geometry.out     |    3 -
src/test/regress/expected/line.out         |  271 ++++++++++++++++++++++++++++
src/test/regress/expected/sanity_check.out |    3 +-
src/test/regress/output/misc.source        |    3 +-
src/test/regress/parallel_schedule         |    2 +-
src/test/regress/serial_schedule           |    1 +
src/test/regress/sql/geometry.sql          |    4 -
src/test/regress/sql/line.sql              |   87 +++++++++
13 files changed, 503 insertions(+), 153 deletions(-)


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