With the Marlin flavor, a "machine envelope limits" G-code section

is emitted, which breaks some of the automatic tests.

Changed the default firmware flavor to RepRap,
so that the automatic tests will run.

xs/src/libslic3r/PrintConfig.cpp

@@ -772,7 +772,7 @@ PrintConfigDef::PrintConfigDef()
     def->enum_labels.push_back("Machinekit");
     def->enum_labels.push_back("Smoothie");
     def->enum_labels.push_back(L("No extrusion"));
-    def->default_value = new ConfigOptionEnum<GCodeFlavor>(gcfMarlin);
+    def->default_value = new ConfigOptionEnum<GCodeFlavor>(gcfRepRap);
 
     def = this->add("infill_acceleration", coFloat);
     def->label = L("Infill");