Revert "Adding a workaround for a bug in openJDK. Calling Toolkit.getDefaultToolkit() after a call to FileManager.findFolder() will cause Toolkit.getDefaultToolkit() to hang."

This reverts commit a8db52d4100e4b8740a3d99d3b0c25e8446e7e46.
Revert "Replaced the RXTXcomm.jar with nrjavaserial.jar to allow the app to be run on 64 bit java in OS X."

This reverts commit 1a440151cb1e292d580bc74d2e6a94f0b3caaef0.