[tex-live] texmf-dist -> texmf for TL'13

[Philip TAYLOR]

Karl Berry wrote:

> For TL 2013, we have been contemplating merging texmf-dist back into
> texmf, so there would once again be a single tree.

I am all in favour of this : I have /never/ understood the
exact role of each of the trees, and may never will, but
if someone who does would like to spell out the role of
each I for one would much appreciate it.

** Phil.