changing all lang_def filename refs to abs paths
total hack to see if this at least works - and it does!
to test this out you'll have to either modify the two filename refs to fit
your local paths, or put copies of lang_def.xml and lang_def.dtd into
c:\users\josh\workspace\Processing-Blocks-Tool\data to match.

BUT! This actually builds and opens up the sample OpenBlocks panel when
run!