Implemented diagnostic functions for numbers, sequences and arrays.

Implemented diagnostic functions for numbers, sequences and arrays.

Two types of diagnostic functions are implemented for numbers. The
first type returns the roundoff error between 2 numbers. The second
type returns the roundoff error as a multiple of the appropriate
precision float-epsilon value.

For sequences and arrays, the diagnostic functions return a list of
the elements that are not equal, noting the element indices, values
and numeric error. Each function has 2 keywords. First, a :TEST
keyword to specify the equality test, default to NUMBER-EQUAL. Second,
an :ERROR-FUNCTION keyword specifying which type of error should be
reported, defaulting to #'NUMBER-ERROR.

NOTE: This is an initial implementation and subject to change.