move cr2re_signal_detect to cr2re_utils.ch and let cr2re_cluster_detect put the results into a table for easier access in cr2re_orders_fit. However somthing broken right now.

git-svn-id: http://svnhq2.hq.eso.org/p2/trunk/Pipelines/cr2re/cr2rep@163141 318c8218-2dab-440d-9263-6f70bac63e5b