UPDATE: added option to register listener when source/target file/channel changes (byt MultiFileR/W)

git-svn-id: https://svn.javlin.eu/svn/cloveretl.opensource/trunk-4-0@16205 a09ad3ba-1a0f-0410-b1b9-c67202f10d70
UPDATE: Changed CloverDataReader to use MultiFileReader for handling various URL format options (including input port references)

git-svn-id: https://svn.javlin.eu/svn/cloveretl.opensource/trunk-4-0@16206 a09ad3ba-1a0f-0410-b1b9-c67202f10d70
FIX: CLO-4333 - MultiFileReaderTest fixed.

git-svn-id: https://svn.javlin.eu/svn/cloveretl.opensource/trunk-4-0@16207 a09ad3ba-1a0f-0410-b1b9-c67202f10d70