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This is the list of changes per version.

2.1 (1999/09/09): Upgrade to version 2.1.

 Bug fix: In response to Unisys's claims that displaying GIF images
	on web sites require licenses from them, converted all images
	to PNG.

2.0 (1999/04/01): Introduction of GridPix type 2.

 New feature: The header uses 64-bit quantities for all fields.  Also,
	integers are stored in a machine-independent byte order.  A
	new magic ("GPX2") denotes a type 2 GridPix file; the old
	type 1 format (with magic "Grid") is still recognized but will
	not be generated by gridpack anymore.

 Bug fix: The "layersize" array in the header was initialized
	incorrectly.  gpxinfo now prints it out.

 Bug fix: Some of the paths (perl and GRIDROOT) in cgi scripts were
	not correctly substituted by the Makefile.

 New feature (UCB only): Add smooth on/off button for toggling JPEG
	smoothing at resolutions >100%.

 New feature: A CHANGELOG file is now included in the release. ;)