Normalise glue setting in log files

LuaTeX can come out slightly differently here to pdfTeX/XeTeX: hopefully
the last digit variations are safe to accept.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4867 de43f980-851b-0410-b2f7-c40aca1f87e0
Normalise units known by engines

In log2tlg, the comment is about 'older pdfTeX versions' but the need for
us for this normalisation is that XeTeX is based on e-TeX only and so
doesn't know these additional units. 


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4868 de43f980-851b-0410-b2f7-c40aca1f87e0