Validate the running PEAR version against the dependency. This dependency is designed
to prevent PEAR versions incompatible with the current package.xml from attempting to install
it. As with all dependency validation, true is returned on success, PEAR_Error on failure
for required dependencies (and the PEAR installer dependency is required). If the
options are specified, an array containing the error message will be returned instead.
throws no exceptions thrown
This function can not be called statically.