Re-add list_url for all R packages (#6110)

* r-igraph: find old packages in the archive

Fixes #6104.

* r-irlba: find old packages in the archive

Fixes #6101.

* r-lazyeval: find old packages in the archive

Fixes #6102.

* packages: set list_url for all packages hosted on CRAN

* packages: consistently use the CRAN archive URLs

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

@@ -35,6 +35,7 @@ class RNmf(RPackage):
 
     homepage = "http://renozao.github.io/NMF"
     url      = "https://cran.r-project.org/src/contrib/NMF_0.20.6.tar.gz"
+    list_url = "https://cran.r-project.org/src/contrib/Archive/NMF"
 
     version('0.20.6', '81df07b3bf710a611db5af24730ff3d0')