Generalized range

[tkpmep at hotmail.com]

Thanks - you have covered a fair bit of gorund here - I will modify
myRange taking your suggestions into account. The one suggestion that
I'm going to have to think through is repeatedly incrementing res.

I deliberately did not use this as repeated addition can cause
rounding errors to accumulate, making the loop run a little longer or
shorter than necessary. I thought I would be far less likely to run
into rounding issues with a multiplicative construct - hence my use of
epsilon, and my question about an appropriate value for it