nile editor update

ver 0.50 has been released devloper note's

Sept 14, 2004
- version 0.50
Fixed some memory/resource leaks
Fixed top window problem with object fill extension dialog
Changed fill extension to drop N objects instead of seeking a density level in an area
Fixed crash caused by deleting objects
Added options check boxes to save dialog - can optionally choose to create/overwrite ancillary files.
Added group button on Object list tab
Fixed 'Absolute' flag not saving for some object types