Romain Pelisse 4155d94028 apply patch 3175832 from Cd-MaN: Add options to to the CPD command line task.
While applying the patch, I discover that properties where never really
used and not passed down to the language implementation. In order to fix
that and keep the loose coupling we currently have, I used the system
properties.
Also did isolate that in a separate function and did a (little) code
cleaning.

git-svn-id: https://pmd.svn.sourceforge.net/svnroot/pmd/branches/pmd/4.3.x@7317 51baf565-9d33-0410-a72c-fc3788e3496d
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