#26 only closing statements that have not already be closed
#26 only closing db connection if it has not been closed already
fixes #28, fixes #26 closing result sets and statements underlying the SqlIterator.java only if they have not been closed before
Merge pull request #104 from HPI-Information-Systems/inputs_closeable

db connections, result sets, and statements are only closed if they have not been previously closed
#16 Fixed bug.
Merge pull request #105 from HPI-Information-Systems/TempFileGeneratorBug

#16 closed.
Merge branch 'master' into ConfigurationSpecificationInteger