pgsql: Add a latex-longtable output format to psql

Add a latex-longtable output format to psql

latex longtable is more powerful than the 'tabular' output format
'latex' uses. Also add border=3 support to 'latex'.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b14f81bc9a65993129e93052634e358b310b8554

Modified Files
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doc/src/sgml/ref/psql-ref.sgml | 31 +++++--
src/bin/psql/command.c | 5 +
src/bin/psql/print.c | 176 ++++++++++++++++++++++++++++++++++++++--
src/bin/psql/print.h | 1 +
4 files changed, 199 insertions(+), 14 deletions(-)

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