smmap2: init at 2.0.3

This commit adds smmap2, which is a separate pypi package from the existing
smmap 0.9.0, though they both come from the same repo. It also moves smmap into
the new python modules location.

pkgs/development/python-modules/smmap2/default.nix

@@ -0,0 +1,20 @@
+{ lib, fetchPypi, buildPythonPackage, nosexcover }:
+
+buildPythonPackage rec {
+  pname = "smmap2";
+  version = "2.0.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1hvn28p3zvxa98sbi9lrqvv2ps4q284j4jq9a619zw0m7yv0sly7";
+  };
+
+  checkInputs = [ nosexcover ];
+
+  meta = {
+    description = "A pure python implementation of a sliding window memory map manager";
+    homepage = https://pypi.org/project/smmap2;
+    maintainers = [ ];
+    license = lib.licenses.bsd3;
+  };
+}