Carp::Clan is a module that reports errors from the
perspective of the caller of a "clan" of modules, similar to
"Carp.pm" itself. Instead of giving it a number of levels to skip
on the calling stack, you give it a pattern to characterize the
package names of the "clan" of modules which shall never be
blamed for any error. These modules stick together like a "clan"
and any error that occurs will be blamed on the "outsider"
script or modules not belonging to this "clan".
