Improved error handling in many places to detect missing files or NULL file handles.
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close() file before dying.
added more unit tests for neuralnets
rename LogitPiecewiseBoundLikelihood class
Merge pull request #2210 from khalednasr/develop

added more unit tests for neuralnets
Merge pull request #2214 from yorkerlin/rename_PiecewiseBoundLikelihood

rename LogitPiecewiseBoundLikelihood class
update the integration class
SGRefObjects not allowed to share RefCount object any more.
Fixed unit test; moved threaded stress_test fo RefCount_unittest.
Parallel and SGIO should not copy ref-count values with copy-constructor;
rather maintain ref-counts on their own.
Removing obsolete test helper stress_test() - which is now in RefCount_unittest.
Move unnecessary include from header to source file.
Merge pull request #2219 from iglesias/develop

Move unnecessary include from header to source file.
added first draft of linalg unifying backend
added cmake options for setting linalg backend libraries
added viennacl support and redesigned linalg policy
added hard requirement for linalg backends cmake options