copied much code from datasets.py to NDVI.py, not completely working yet
bugs fixed, wrong parent for new controls
additional controls on NDVI setup form
layout improvements
layout improvements
layout improvements
work to improve overall layout
reworked splitter layout based on:
http://www.blog.pythonlibrary.org/2013/10/18/wxpython-an-introduction-to-splitterwindows/
tweak panel sizes, cleanup comments
size and layout tweaks
added new fields to table 'NDVIcalc'