pgsql: Add checks for interval overflow/underflow

Add checks for interval overflow/underflow

New checks include input, month/day/time internal adjustments, addition,
subtraction, multiplication, and negation. Also adjust docs to
correctly specify interval size in bytes.

Report from Rok Kralj

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/146604ec43bcd6f977c31775a91022cf9737daf5

Modified Files
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doc/src/sgml/datatype.sgml | 2 +-
src/backend/utils/adt/datetime.c | 3 +
src/backend/utils/adt/timestamp.c | 96 +++++++++++++++++++++++++++--
src/interfaces/ecpg/pgtypeslib/interval.c | 3 +
4 files changed, 97 insertions(+), 7 deletions(-)

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