break biggles.py into separate files for containers vs plot objects?

[beckermr]

Should we break biggles.py into separate files for containers vs plot objects? We would need a utils file as well for common stuff used in both places. The only problem with this proposal I see right now is that it might break the history of a given object in git. (I am not a git ninja, so if there is a clean way to do this, please let me know!) The advantage here is future maintenance of course, as ~2800 line files are hard for humans to parse and maintain.

[nolta]

There isn't much git history to preserve (i didn't port the sourceforge logs), so that shouldn't be an impediment.

[beckermr]

OK. Then I should do this next before much more new stuff is added. This way as much history as possible is saved.