pgsql: Add \watch [SEC] command to psql.

Add \watch [SEC] command to psql.

This allows convenient re-execution of commands.

Will Leinweber, reviewed by Peter Eisentraut, Daniel Farina, and Tom Lane

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/c6a3fce7dd4dae6e1a005e5b09cdd7c1d7f9c4f4

Modified Files
--------------
doc/src/sgml/ref/psql-ref.sgml | 12 ++++
src/bin/psql/command.c | 130 ++++++++++++++++++++++++++++++++++++++++
src/bin/psql/help.c | 3 +-
src/bin/psql/tab-complete.c | 2 +-
4 files changed, 145 insertions(+), 2 deletions(-)

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