Just more details in an error message.. this IllegalStateException still
appears sometimes when the ClusteringBuilderState runs.. something is
very wrong.
Logging transformation error. Removed un-used COL (Apache Commons Utils
Logging), and xbase.  Made tests plug-in free of Log4j.
Minor: Comment, typo and line break for readability changed, only.
minor: Better error message in test helper, and comment, only
TEMP commenting out earlier changes made to show that BigDecimal &
BigInteger support is not working.. AttributeTest green again.  Will
revert this commit later when fixing numbers.