Support infinity and -infinity in the numeric data type.

Forbid numeric NaN in jsonpath

Improve error reporting for jsonpath .double() method

Fix power() for large inputs yet more.

Fix power() for infinity inputs some more.

Fix behavior of exp() and power() for infinity inputs.

Silence _bt_check_unique compiler warning.

Sync behavior of var_samp and stddev_samp for single NaN inputs.

Fix behavior of float aggregates for single Inf or NaN inputs.