*	matrix powers for rational numbers, and scalar^matrix (as matlab
	does it)

*	add gui display to genius and use when genius run in X

*	extern and global variables

*	add try/catch operator for exceptions (need special exception
	variable like return_val)

*	interrupt internal mpwrap calculation (need new error type)

*	result display (optional) ... for matrix display and normal
	numbers ...

*	plugin support

*	cleanup engine, separate parsing/execution

*	more calculator functions for use in plugins etc
