Runnnig under Anaconda envrionment, pillow requirement and invalid value to Gauge issue

[szmurlor]

I've been struggling a little with making the dicompyler run under Anaconda environment and just thought I could share my experiences.

Summary of this short pull request:

a) added pillow to requirements.txt as it is necessary to make properly work the 2dview.py plugin,
b) fixed an issue with incorrect Gauge value when the dicom tree was traversed,
c) added Anaconda environment file which can be easily used to create a fully eligible anaconda environment for running dicompiler (tested under Ubuntu 18.04 and Windows 10).

Hope this could improve the really great project!

[bastula]

Thanks for the helpful PR! I will take a look and see if we can add this.