Test whether the two points are effectively the same.
Points are considered equal if they have the same x amd y
coordinates. This represents value equality for the points in
question.
The underlying components of an XPoint are represented as
floating point numbers. Floating point numbers are subject to
rounding errors, so there has to be a degree of latitude when
comparing coordinate values. The degree of latitude is, by default,
determined by the limitations defined in the PDF Specification.
This is, broadly speaking, 5 decimal points so the default epsilon
is typically 0.00001. However if you wish to rely on a specific
epsilon value you should provide one.
