The configuration file had been renamed.
Also, mention docstrap in INSTALL and make the documentaion configure check
for the required tools (doxygen, dot (graphvis), mscgen, and transfig).
Rename TOPDIR to TOPSRC, can't get around requiring it and it's more
descriptive this way anyway. Also, revert the use of the m4_esyscmd()
macro in configure. It's kinda cool, but I'll come up with a better way
to do it.
We need to figure out a way to make docs in unusual places, like in the
SourceForge shell environment -- which doesn't have an extremely recent
autotools. This is an extremely stripped-down automake/autoconf setup that
provides the bare minimum needed to AC_SUBST variables.
It's dirty and hacky, but it kinda works.
