Add c++17,c++20 and c++23 kernels all with openmp

Author: mcbarton

share/jupyter/kernels/xcpp17-omp/kernel.json.in

@@ -1,16 +1,16 @@
 {
-  "display_name": "C++17 (xcpp+OpenMP)",
+  "display_name": "C++17 + OpenMP",
   "env": {
       "PATH":"@XEUS_CPP_PATH@",
-      "LD_LIBRARY_PATH":"@XEUS_CPP_LD_LIBRARY_PATH@"
+      "LD_LIBRARY_PATH":"@OpenMPLibraryDir@"
   },
   "argv": [
       "@XEUS_CPP_KERNELSPEC_PATH@xcpp",
       "-f",
       "{connection_file}",
       "-resource-dir", "@XEUS_CPP_RESOURCE_DIR@",
       "-I", "@XEUS_CPP_INCLUDE_DIR@",
-      "-std=c++17"@XEUS_CPP_OMP@
+      "-std=c++17","@XEUS_CPP_OMP@"
   ],
   "language": "cpp",
   "metadata": {"debugger": false

share/jupyter/kernels/xcpp20-omp/kernel.json.in

@@ -0,0 +1,18 @@
+{
+  "display_name": "C++20 + OpenMP",
+  "env": {
+      "PATH":"@XEUS_CPP_PATH@",
+      "LD_LIBRARY_PATH":"@OpenMPLibraryDir@"
+  },
+  "argv": [
+      "@XEUS_CPP_KERNELSPEC_PATH@xcpp",
+      "-f",
+      "{connection_file}",
+      "-resource-dir", "@XEUS_CPP_RESOURCE_DIR@",
+      "-I", "@XEUS_CPP_INCLUDE_DIR@",
+      "-std=c++20","@XEUS_CPP_OMP@"
+  ],
+  "language": "cpp",
+  "metadata": {"debugger": false
+  }
+}

share/jupyter/kernels/xcpp20-omp/logo-32x32.png

@@ -0,0 +1,18 @@
+{
+  "display_name": "C++23 + OpenMP",
+  "env": {
+      "PATH":"@XEUS_CPP_PATH@",
+      "LD_LIBRARY_PATH":"@OpenMPLibraryDir@"
+  },
+  "argv": [
+      "@XEUS_CPP_KERNELSPEC_PATH@xcpp",
+      "-f",
+      "{connection_file}",
+      "-resource-dir", "@XEUS_CPP_RESOURCE_DIR@",
+      "-I", "@XEUS_CPP_INCLUDE_DIR@",
+      "-std=c++23","@XEUS_CPP_OMP@"
+  ],
+  "language": "cpp",
+  "metadata": {"debugger": false
+  }
+}