Config: Add default mage solver for new configuration.

src/config.py

@@ -250,6 +250,13 @@ class Config(SQL):
         # Solvers
         self._solvers = []
 
+        posix = os.name == 'posix'
+        ctor = solver_type_list["mage8"]
+        new = ctor("default-mage")
+        new._description = "Default PAMHYR mage 8 version"
+        new._cmd_solver = f"""@install_dir/mage/mage{"" if posix else ".exe"} -fp=1 @input"""
+        self._solvers.append(new)
+
         # Meshing tool
         self.meshing_tool = ""