sedkit assumes uniform distribution for age of the object

[rkiman]

Function evaluate() in isochrone.py assumes uniform distribution for the age of the object, which is useful when we only have a range of possible ages. It would be useful to have the option to have this as normal distribution when the age is well defined.

[SherelynA]

I agree Rocio, I think this would be a simple fix and an important one like you mentioned for objects with well defined ages. I will get on it to have it as part of the next release.