OpenDoPEHandler.setRemoveSdtCellsOnFailedCondition() documentation bug and clean-up, eclipse m2e support

fed4065: After curing the thread safety problem (http://www.docx4java.org/forums/data-binding-java-f16/opendopehandler-is-not-thread-safe-t734.html), OpenDoPEHandler.setRemoveSdtCellsOnFailedCondition was converted into a member function, but the javadoc was not updated.
Also, there were several unused variables and some non-static calls to static functions in the class.

be3b243: eclipse m2e support for codehaus maven plugin build-helper