Get Rid of nobuild, nolink, and alldeps (#2765)

* Removing the nobuild, nolink, and alldeps dependency types in favor of being explicit.
* This will help with maintenance going forward, as adding more dependency types won't affect existing declared dependencies in weird ways.
* default deptype is still `('build', 'link')`

var/spack/repos/builtin/packages/r-class/package.py

@@ -35,4 +35,4 @@ class RClass(RPackage):
 
     version('7.3-14', '6a21dd206fe4ea29c55faeb65fb2b71e')
 
-    depends_on('r-mass', type=nolink)
+    depends_on('r-mass', type=('build','run'))