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/py-openpyxl/package.py

@@ -35,7 +35,7 @@ class PyOpenpyxl(Package):
 
     extends('python')
 
-    depends_on('py-jdcal', type=nolink)
+    depends_on('py-jdcal', type=('build', 'run'))
     depends_on('py-setuptools', type='build')
 
     def install(self, spec, prefix):