Version 2.0 of xsky is not really that much different from version 1.0.  Here
is a summary of the chief differences:

1)  a few unnecessary fields were stripped out of var.dat.  The correct
	version of var.dat for xsky v2.0 is 2,273.134 bytes long

2)  code written by Brian Wing has been added which greatly speeds up display
	updates for large databases such as SAO

3)  support has been added for several databases from the NASA CD-ROM
	"Selected Astronomical Catalogs, volume 1"

4)  a lot more work has gone into the translation of the RNGC descriptions of
	objects into English; there are only a few ambiguities left which fail
	to translate properly

5)  support has been added for a user-supplied catalog to allow easy creation
	of finder charts for comets, asteriods, etc.

6)  code was rearranged so that addition or deletion of catalog support only
	requires recompilation of one small module and a relink

7)  a very few minor bug fixes were incorporated


A word about future directions:

xsky is probably not going to get much more functionality.  I'll look at the
constellation boundary database; if I can figure a nice way to do so, I'll add
a constellation boundary overlay capability.  Adding new astronomical catalogs
has to become easier.

xsky will become more and more dependent on the above-mentioned CD-ROM.  I'd
like to get completely out of the business of distributing any catalogs what-
soever.
