FIX: CLO-3941 Explicit metadata propagation

Some tweaks and fixes of previous commits.

git-svn-id: https://svn.javlin.eu/svn/cloveretl.opensource/trunk-4-0@16292 a09ad3ba-1a0f-0410-b1b9-c67202f10d70
FIX: CLO-4577 - MultiFileReader: input port stream reading fixed.

git-svn-id: https://svn.javlin.eu/svn/cloveretl.opensource/trunk-4-0@16293 a09ad3ba-1a0f-0410-b1b9-c67202f10d70