Add selectable zoom area to viewer
Add debug configuration property
Save current directory for file operations
Use Point2D.Double where possible
Updated TODO in README
Updated PDF documentation for 1.0.5
Updated icon image with blurred/posterized filtering
Set rendering hints for Splash image
Revert usage of ExecutorService for rendering jobs
Add debugging display of grid/zoom centre and iteration count/scale
Fix algorithm for calculating zoomed view
Make minimum transform size grid snap distance
Improved debugging display of numbers
Updated PDF with gallery images
Better Koch curve IFS
Change count to long to prevent overflow
Add suffix to identify debug numbers
Make IFS a SortedSet delegate
Use property files for configuration
Updated PDF documentation