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material IDs conflict caused by depletion

2

## Bug Description When you run a depletion, the ids of several classes, including openmc.Material, are reset after the depletion. This causes a conflict of IDs if you create a...

Enhancement: Streamline Material Differentiation in DAGMC Simulations to Support Independent Cell Depletion and Temperature Fields

2

## Problem Description When conducting simulations using DAGMC (Direct Accelerated Geometry Monte Carlo), we encounter a scenario where the need arises to differentiate materials that originally are identical but occupy...

Implement vector fitting to replace external `vectfit` package

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# Description This pull request removes the dependency on the unmaintained external `vectfit` package (https://github.com/liangjg/vectfit) used in OpenMC's windowed multipole (WMP) infrastructure. In its place, a vector fitting is introduced...

WMP compatibility issues

3

## Bug Description I am interested in using the **windowed multipole (WMP)** format to generate **transient perturbed fission matrices**, which requires the use of **tally derivatives with respect to temperature**....