Install as module by default

configure.py

@@ -165,7 +165,7 @@ def set_defaults():
                 break
 
     default_sipbindir = plat_bin_dir
-    default_sipmoddir = plat_py_site_dir
+    default_sipmoddir = os.path.join(plat_py_site_dir, 'sip4_tqt')
     default_sipincdir = plat_py_inc_dir
     default_sipsipdir = plat_sip_dir
 
@@ -257,10 +257,12 @@ def create_makefiles(macros):
 
     sipconfig.inform("Creating top level Makefile...")
 
+    open('__init__.py', 'a').close()
+
     sipconfig.ParentMakefile(
         configuration=cfg,
         subdirs=["sipgen", "siplib"],
-        installs=(["sipconfig.py", os.path.join(src_dir, "sipdistutils.py")],
+        installs=(["__init__.py", "sipconfig.py", os.path.join(src_dir, "sipdistutils.py")],
                 cfg.sip_mod_dir)
     ).generate()