pgsql: Improve pretty printing of viewdefs.

Improve pretty printing of viewdefs.

Some line feeds are added to target lists and from lists to make
them more readable. By default they wrap at 80 columns if possible,
but the wrap column is also selectable - if 0 it wraps after every
item.

Andrew Dunstan, reviewed by Hitoshi Harada.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/2f582f76b1945929ff07116cd4639747ce9bb8a1

Modified Files
--------------
doc/src/sgml/func.sgml                     |   12 ++-
src/backend/utils/adt/ruleutils.c          |  137 +++++++++++++++++++++++++++-
src/include/catalog/catversion.h           |    2 +-
src/include/catalog/pg_proc.h              |    2 +
src/include/utils/builtins.h               |    1 +
src/test/regress/expected/polymorphism.out |    4 +-
src/test/regress/expected/rules.out        |   33 +++++++
src/test/regress/expected/with.out         |   25 +++---
src/test/regress/sql/rules.sql             |    6 +
9 files changed, 204 insertions(+), 18 deletions(-)