Add gap procesing after import

Process the areas with built area that are not included in any district

\approve @laurens @shinde @tara

setup.py

@@ -30,8 +30,7 @@ setup(
     license="AGPLv3+",
     install_requires=[
         "numpy",
-        # "exposurelib@https://git.gfz-potsdam.de/dynamicexposure/globaldynamicexposure/exposure-lib/-/archive/master/exposure-lib-master.zip",  # noqa: E501
-        "exposurelib@https://git.gfz-potsdam.de/dynamicexposure/globaldynamicexposure/exposure-lib/-/archive/46-speed-up-the-clean_up_reference-function/exposure-lib-46-speed-up-the-clean_up_reference-function.zip",  # noqa: E501
+        "exposurelib@https://git.gfz-potsdam.de/dynamicexposure/globaldynamicexposure/exposure-lib/-/archive/master/exposure-lib-master.zip",  # noqa: E501
     ],
     extras_require={
         "tests": tests_require,