CKAN cleanup script... and some minor typo fixing in other parts

Solves issue #62 
Please, forget changes in CKANBackenImpl.java in this PR... I wrongly create the feature/62 branch from bug/compound_persistence_ckan instead that from develop. Thus, diff on this file should "disappear" in the present PR when PR #97 gets merged (before the current PR) and feature/62 "updated" by merging develop.

NTC (just a remark).