remove testing edits

update plotter for new matplotlib

use gdal config instead of environment vars

updated chapter 13 code and rename files

add sys back into chapter 3 code

rename chapter 12 files

update chapter 11 code, add new listings, rename files

split chapter 11

update chapter 10 code and rename files

update chapter 9 code and rename files

rename chapter 8 files

update and add new chapter 7 code

update chapter 6 code and rename files

split chapter 6

update chapter 4 code and rename files