etex, pdftex, omega

[K. Berry]

     -- Introducing a new directory texmf/etex/.
     -- Telling that below this directory the same structural conventions
        as below texmf/tex/ is used.
     -- Telling that only e-TeX-specific files are placed there, general
        TeX files still belong in texmf/tex/.
     -- Adding a note that e-TeX is expected to search files both in its
        own directory tree and in texmf/tex/.

This sounds good to me.  If there are no objections from others, I will
try to write up the text.