13 Apr 2001 v0.3.1
	Ported the code to a library
	Added a tree deallocation procedure
1  Apr 2001 v0.3.0
	I have added array support. Now this program can be used to
	render most of common equation types (probably)
25 Mar 2001 v0.2.0, v0.2.1
	I have rewritten the code to gain modularity. Implemented
	devices are \frac, \sqrt, \sum, \int, and sub/superscript.
24 Mar 2001 v0.1.0
	I have visualised my conception about this renderer. I have
        imagined and designed all the data structures and their
        relationships.
