- src/musrFT.cpp: the timed Transform() loop over all PFourier objects is now parallelized. Added OpenMP::OpenMP_CXX linkage to the musrFT CMake target (it wasn't linked before).
- src/classes/PMusrCanvas.cpp (HandleFourier() and HandleDifferenceFourier()): split each loop into three phases — serial PFourier construction (FFTW plan creation isn't thread-safe), a parallel Transform()
loop (pure FFTW compute, safe to parallelize), and serial ROOT histogram creation/styling (ROOT globals aren't thread-safe). PMusr already links OpenMP, so only the #include <omp.h> and the pragma were
needed.
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