Replacing Simpson's rule integration from SBProfile Simpson.h

[rmandelb]

Currently Simpson.h has a NR-based routine for integration by Simpson's rule, which Gary modified so it's written as a template with the integrand as the template argument. We should replace this with some alternative, such as Mike's integration package. Gary points out the decision to be made: whether to adopt the templating interface, or to change sbprofile to do more traditional function calls. The advantage of the template is that the integrand can be a class instead of a function, which allows better control of internal variables.

[rmjarvis]

My integration package also allows the integrand to be a class. I've assigned this to issue to me, since I think it will be pretty trivial for me to adjust the code to use my integrator instead of the current one.

[rmjarvis]

I finished replacing the occurrences of Simp1d with int1d and I removed Simpson.h, so I'm closing this issue as fixed.