pynml-modchananalysis: allow saving of plots without user intervention (for batch processing)

[sanjayankur31]

At the moment, if one uses -nogui, only the data files are stored but the figures (which are generated) are just discarded. Ideally, when a user says -nogui the data and the figure files should be saved. This will allow batch processing where I can run pynml-modchananalsyis * on a bunch of files and just let it run. At the moment, the graphs are generated and users have to manually save them to file.

[YBCS]

@sanjayankur31 can I work on this

[sanjayankur31]

Sure, assigned to you now

@YBCS : please do start working on your proposal for GSoC if you haven't already. We'll be able to give you feedback by wednesday evening. (We have Friday and Monday as holidays here, so we wont be working from Friday until Tuesday)