Refactor verification method and optimize numerical kernels with oneMKL BLAS

This commit transitions the verification approach from post-Newtonian theory
   comparison to regression testing against baseline simulations, and optimizes
   critical numerical kernels using Intel oneMKL BLAS routines.

   Verification Changes:
   - Replace PN theory-based RMS calculation with trajectory-based comparison
   - Compare optimized results against baseline (GW150914-origin) on XY plane
   - Compute RMS independently for BH1 and BH2, report maximum as final metric
   - Update documentation to reflect new regression test methodology

   Performance Optimizations:
   - Replace manual vector operations with oneMKL BLAS routines:
     * norm2() and scalarproduct() now use cblas_dnrm2/cblas_ddot (C++)
     * L2 norm calculations use DDOT for dot products (Fortran)
     * Interpolation weighted sums use DDOT (Fortran)
   - Disable OpenMP threading (switch to sequential MKL) for better performance

   Build Configuration:
   - Switch from lmkl_intel_thread to lmkl_sequential
   - Remove -qopenmp flags from compiler options
   - Maintain aggressive optimization flags (-O3, -xHost, -fp-model fast=2, -fma)

   Other Changes:
   - Update .gitignore for GW150914-origin, docs, and temporary files

AMSS_NCKU_source/TwoPunctures.C

@@ -27,6 +27,7 @@ using namespace std;
 #endif
 
 #include "TwoPunctures.h"
+#include <mkl_cblas.h>
 
 TwoPunctures::TwoPunctures(double mp, double mm, double b,
                            double P_plusx, double P_plusy, double P_plusz,
@@ -891,25 +892,17 @@ double TwoPunctures::norm1(double *v, int n)
 /* -------------------------------------------------------------------------*/
 double TwoPunctures::norm2(double *v, int n)
 {
-  int i;
-  double result = 0;
-
-  for (i = 0; i < n; i++)
-    result += v[i] * v[i];
-
-  return sqrt(result);
+  // Optimized with oneMKL BLAS DNRM2
+  // Computes: sqrt(sum(v[i]^2))
+  return cblas_dnrm2(n, v, 1);
 }
 
 /* -------------------------------------------------------------------------*/
 double TwoPunctures::scalarproduct(double *v, double *w, int n)
 {
-  int i;
-  double result = 0;
-
-  for (i = 0; i < n; i++)
-    result += v[i] * w[i];
-
-  return result;
+  // Optimized with oneMKL BLAS DDOT
+  // Computes: sum(v[i] * w[i])
+  return cblas_ddot(n, v, 1, w, 1);
 }
 
 /* -------------------------------------------------------------------------*/