The CARMA termination condition based on search radius

[kaveh096]

I don't know yet what is a good termination condition so I'm using a combination of many criteria. There is room for improvement specially with search radius.

[kaveh096]

On the other hand, the more I check, i feel it's actually not that important. At the end of the day a few wrong h-values cannot do much harm. The iterative CASPER can always recover from that. I'm gonna keep this issue open for now but I will not consider this as a bug for now.