created separate get_nsrdb_psm4_ functions

Author: williamhobbs

pvlib/iotools/__init__.py

@@ -11,9 +11,12 @@
 from pvlib.iotools.psm3 import get_psm3  # noqa: F401
 from pvlib.iotools.psm3 import read_psm3  # noqa: F401
 from pvlib.iotools.psm3 import parse_psm3  # noqa: F401
-from pvlib.iotools.psm4 import get_psm4  # noqa: F401
-from pvlib.iotools.psm4 import read_psm4  # noqa: F401
-from pvlib.iotools.psm4 import parse_psm4  # noqa: F401
+from pvlib.iotools.psm4 import get_nsrdb_psm4_aggregated  # noqa: F401
+from pvlib.iotools.psm4 import get_nsrdb_psm4_tmy  # noqa: F401
+from pvlib.iotools.psm4 import get_nsrdb_psm4_conus  # noqa: F401
+from pvlib.iotools.psm4 import get_nsrdb_psm4_full_disc  # noqa: F401
+from pvlib.iotools.psm4 import read_nsrdb_psm4  # noqa: F401
+from pvlib.iotools.psm4 import parse_nsrdb_psm4  # noqa: F401
 from pvlib.iotools.pvgis import get_pvgis_tmy, read_pvgis_tmy  # noqa: F401
 from pvlib.iotools.pvgis import read_pvgis_hourly  # noqa: F401
 from pvlib.iotools.pvgis import get_pvgis_hourly  # noqa: F401