Add py-matplotlib-scalebar 0.6.1

Provides a new artist for matplotlib to display a scale bar, aka micron bar. It
is particularly useful when displaying calibrated images plotted using
plt.imshow(...).

• While I'm here:
  • Add LICENSE_FILE
  • Use USE_LOCALE instead of patch file

WWW: https://github.com/ppinard/matplotlib-scalebar

PR: 241508
Submitted by: Rainer Hurling <rhurlin@gwdg.de>