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-xlconnectjars/package.py

@@ -30,6 +30,7 @@ class RXlconnectjars(RPackage):
 
     homepage = "http://miraisolutions.wordpress.com/"
     url      = "https://cran.r-project.org/src/contrib/XLConnectJars_0.2-9.tar.gz"
+    list_url = "https://cran.r-project.org/src/contrib/Archive/XLConnectJars"
 
     version('0.2-12', '6984e5140cd1c887c017ef6f88cbba81')
     version('0.2-9', 'e6d6b1acfede26acaa616ee421bd30fb')