Even after installing the [FIX][ENH] in Stephan's routines and 
recompiling the plugin, the following computations behave erratically:


	16r1FFFFFFFF gcd: 16r100000000000000
	16r1000000000000000/16r1000000000000000

these freeze, and the following:

	16r1000000000000000//16r1000000000000000
	16r1000000000000000\\16r1000000000000000

return varied results, the first tends to be either 254 or zero, the 
second tends to be odd negative numbers.