DJUTILS utilities for unit tests

Element	Missed Instructions	Cov.	Missed Branches	Cov.	Missed	Cxty	Missed	Lines	Missed	Methods	Missed	Classes
Total	30 of 408	92%	12 of 32	62%	12	39	4	91	1	23	0	3
org.djutils.test		92%		62%	12	39	4	91	1	23	0	3