Use kpse libarary to find TEXMFHOME


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4978 de43f980-851b-0410-b2f7-c40aca1f87e0
Add Will's suggested diagnostic messages


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4979 de43f980-851b-0410-b2f7-c40aca1f87e0
Be more specific with error message for missing lvt


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4980 de43f980-851b-0410-b2f7-c40aca1f87e0