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Add new generator: PowerTermGenerator

The new generator produces a line of 1-D points according to the
equation:
	y = A((x-xf)/a)^n + yf
The parameter yf acts as a focus point around which the point density
will be highest, decreasing as we move away from it.

The generator takes the arguments axis, units, start, stop, focus,
exponent (n), and divisor (a)
 - 'start' is used to find xf (where y(xf)=yf):
	xf = a * nth root(|start - focus|)
 - 'stop' determines the scan size:
	size = int(f^-1(stop))
 - 'A' will be 1 or -1, determined from start, stop, focus and exponent
	arguments (the sign of 'a' is ignored)
 -  If the exponent is even, it is assumed that we will pass
	through the focus point.

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