minor: h5 conversion progress bar wrong maximum

[Martin Schorb]

Hi,

the converter does not show the proper maximum shape in the progress bar:

in this example, it shows 630, while you can see in the line below it is continuing to process further (until 768).

[Martin Schorb]

It does the same with 1920/2058, 120/128, 480/512,30/32 , ...

[Constantin Pape]

Thanks for raising this. I have also noticed this before, there is something not working correctly
in the way I compute the chunks. I will look into this after implementing the proper 2d support.

[Constantin Pape]

Fixed by #31