Assign __main__ as name of executed scripts

kuroko.c

@@ -204,7 +204,7 @@ int main(int argc, char * argv[]) {
 		 * collect the result of the last one and use it as the
 		 * exit code if it's an integer. */
 		for (int i = optind; i < argc; ++i) {
-			KrkValue out = krk_runfile(argv[i],1,"<module>",argv[i]);
+			KrkValue out = krk_runfile(argv[i],1,"__main__",argv[i]);
 			if (i + 1 == argc) result = out;
 		}
 	}

test/testImportContext.krk.expect

@@ -0,0 +1 @@
+Hello, world: dummy I am a module.

test/testModuleName.krk

@@ -0,0 +1,4 @@
+if __name__ == '__main__':
+    print("You called me directly!")
+else:
+    print("My name is",__name__,"so I must have been imported.")

test/testModuleName.krk.expect

@@ -0,0 +1 @@
+You called me directly!