Undo the merge commit 7a0f008c6d115ff506210d680645532dfc7b903f
Undo the merge commit 7a0f008c6d115ff506210d680645532dfc7b903f

I was not careful earlier at commit 7a0f008 where I accidentally
checked in the conflicted file loo.cpp.

lilulu/openmc,lilulu/openmc,lilulu/openmc