Moving everything in src/ up a level

[Sam Hartman]

I think the clean and correct long-term solution is to move the autoconf
stuff up a level.  That seems to be best practice (or at least one of
them). For packages as large as krb5, I think pulling everything up from
src doesn't make as clean of a tree.
Also, the history and patch issue is quite real.

So in preference order:

1) move autoconf stuff up a level

2) src/doc references ../../doc

3) status quo

4) doc moves to src/doc

5) src moves up a level.

--sam