ncurses package builds ncurses and ncursesw (#3953)

* ncurses package will build ncurses and ncursesw

* Added libs property to ncurses, added fix for hstr

* flake8 is a harsh mistress

* make libs() more robust

* atop depends on ncurses

* fish depends on ncurses

* libtermkey and nano depend on ncurses

* Adjust url spacing

var/spack/repos/builtin/packages/nano/package.py

@@ -33,3 +33,5 @@ class Nano(AutotoolsPackage):
 
     version('2.6.3', '1213c7f17916e65afefc95054c1f90f9')
     version('2.6.2', '58568a4b8a33841d774c25f285fc11c1')
+
+    depends_on('ncurses')