Corrected bug where nothing was outputted when converting from toolbox to typecraft with certain tier structures.
Corrected bug that generated an error if no morphemes exist for a given word (the xml schema enforces at least one morpheme per word).
Comment and PEP corrections.
Addition of timing and participants information to the output of conversion to Typecraft
Refinement of the empty conversion bug fix and of the ELAN timing information.
 Corrected a bug where annotations were being duplicated in the typecraft output, and a test case for this was created.