fix helper widget to page through images

[ambarb]

• and maybe it should be moved to the same module as making movie code

csxtools/csxtools/helpers/fastccd.py

Line 15 in 16ef10c

def browse_3Darray(res,title='Frame'):#, extra_scalar_dict=None):

needs to have an additional argument for im

maybe also best to make a plot_image function with **kwargs for pyplot. then the axis returned can be used for the widget or the movie functions.

[ambarb]

This also fails on flake8 so it needs to be fixed. Andi will do it as it needs testing, but helpers need to be re-worked for axis anyway.

[ambarb]

#101 also