[tex-live] serious problem with mktextfm or mktexdir and `~'

[Karl Berry]

    $ /usr/local/TeXLive/Master/texmf/web2c/mktexnam larm1000
    ~/.texlive2008/texmf-var/fonts/pk/ljfour/lh/lh-t2a/larm1000.600pk:\

I changed things so kpsewhich --expand-var also does tilde expansion,
and checked in the new code and a new kpsewhich binary.  Let me know if
still broken.

Thanks,
karl