use safe_repr to print arg vals in trace
use safe_repr to print arg vals in trace

This fixes a problem in which extremely long (and slow) stack traces would be produced when
function parameters are large numpy arrays.

karandesai-96/joblib,lesteve/joblib,aabadie/joblib,joblib/joblib,joblib/joblib,tomMoral/joblib,tomMoral/joblib,aabadie/joblib,karandesai-96/joblib,lesteve/joblib