Add antenna models to advanced tests.

tests/models_advanced/antenna_GSSI_1500_fs/antenna_GSSI_1500_fs.in

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+#title: GSSI 1.5GHz 'like' antenna in free-space
+#domain: 0.250 0.187 0.183
+#dx_dy_dz: 0.001 0.001 0.001
+#time_window: 8E-9
+
+#python:
+from user_libs.antennas import antenna_like_GSSI_1500
+antenna_like_GSSI_1500(0.125, 0.094, 0.100)
+#end_python:
+

tests/models_advanced/antenna_MALA_1200_fs/antenna_MALA_1200_fs.in

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+#title: MALA 1.2GHz 'like' antenna in free-space
+#domain: 0.264 0.189 0.220
+#dx_dy_dz: 0.001 0.001 0.001
+#time_window: 6e-9
+
+#python:
+from user_libs.antennas import antenna_like_MALA_1200
+antenna_like_MALA_1200(0.132, 0.095, 0.100)
+#end_python:
+