Helper function that returns the tolerance to be used in internal computations.
Arguments
- overwrite
 NULLor numeric scalar. If specified, use this value instead of the option value.
Details
There are two different tolerances used in the package, for details see
graphicalExtremes-package. The default values for these tolerances can be
set using the options "graphicalExtremes.tol.small" and
"graphicalExtremes.tol.large".
See also
Other default parameters:
get_alert_function(),
get_mc_cores()