~tile/xtile/basics

Functions and definitions that are either needed by several modules,
or required to be loaded before other modules are compiled, or
both, or neither, or whatever other junk didn't seem to belong anywhere
else.
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common.lisp		Place intended to be a repository for miscel-
				laneous functions used by more than
				one module, but don't belong in the
				user-interface module.  Unfortunately,
				so far I've only come up with one such
				function.
defvar.lisp		Intended place for defining global variables
				and parameters, preferrably just those
				that are needed in more than one
				module or file.  The advantage of
				putting them here is that defvar is
				compiled before other files.
package.lisp		The one file that must be loaded before any other
				xtile file, because it sets up the
				"XTILE" package to use the correct set
				of other packages.
