1.5

Changed the behavior of table_insert(). Changes are described in 
the manual.

1.4

Reverted to ints for key and values.  Jenkins hash value would be
the same when converting floats to ints to hash keys.  If you had
a set of values < 0, they would get stored on one hash chain.

1.3

the idx component of struct table_key and the num component of struct
table_value are now floats;
