Restructuring pyTables segment
Restructuring pyTables segment

I pulled the conversion from the batchPopup and created its own menu
(dataPopup). I have furthermore attempted to reduce the redundancy in
ptFile, ptFilename and ptFileNameStr. Lastly, I have adjusted the
batchProcess function to look for the pytables.h5 file in the
self.batchFolder and use that (if it's present). Second lastly (don't
ask), I have removed the final 2 lines of batchConvert as they are no
longer meaningful after splitting convert and processing.

Issues: The program does not create any new mzXML files if reading from
the pyTables file (obviously), but some people might complain about that
*shrug*

Tarskin/LaCyTools