- Move configure.ac to the project's root.

- Separate m4 macros into *.m4 files (it is much easier to run aclocal now).
- Remove unused DOMAINNAME macro and --with-hostname= options as the DOMAINNAME macro isn't used anywheres and its use shouldn't be encouraged.
- autogen.sh to bootstrap the buildsystem. We now maintain setup.h with autoheader.
- --disable-blah now does the opposite of --enable-blah. The same for --with-blah and --without-blah. (This makes Gentoo users happier).

autogen.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+cd "$(dirname "${0}")"
+
+ACLOCAL_AMFLAGS=(-I autoconf/m4)
+
+aclocal "${ACLOCAL_AMFLAGS[@]}"
+autoconf
+autoheader