added test file

vent.g

+G21 ; All units in mm
+
+; Cut Feedrate 400
+; Move Feedrate 4000
+
+G28 ; home all
+
+M5
+
+G00 X2.762953 Y240.677863 F4000
+
+M3
+G01 S0.1 X132.762873 Y240.677863 F400
+G01 S0.1 X132.762873 Y1.678163 F400
+G01 S0.1 X2.762953 Y1.678163 F400
+G01 S0.1 X2.762953 Y240.677863 F400
+G01 S0.1 X2.762953 Y240.677863 F400
+M5
+
+G00 X67.763619 Y71.178072 F4000
+M3
+G02 S0.1 X32.407879 Y85.822898 I0.000000 J50.000566 F400
+G02 S0.1 X17.763053 Y121.178638 I35.355739 J35.355739 F400
+G02 S0.1 X32.407510 Y156.533259 I49.998760 J0.000000 F400
+G02 S0.1 X67.763619 Y171.178146 I35.356109 J-35.356428 F400
+G02 S0.1 X103.118876 Y156.533113 I-0.000000 J-49.998906 F400
+G02 S0.1 X117.762774 Y121.178638 I-35.355859 J-35.354475 F400
+G02 S0.1 X103.118507 Y85.823044 I-50.001564 J-0.000000 F400
+G02 S0.1 X67.763619 Y71.178072 I-35.354888 J35.353184 F400
+G01 S0.1 X67.763619 Y71.178072 F400
+M5
+
+G28 ; home all