0.8.10.56:

0.8.10.56:
        MORE ALIENS! sb-grovel now defines alien structures.

        Affected:
        ... sb-grovel, obviously. Reworked the def-to-lisp mechanism a bit
            and then hacked foreign-glue.
        .... array-data.lisp isn't needed by sb-grovel any more, and any
             code that uses it will probably break anyway; removed it.
        .... The Manual: Now there's a section on sb-grovel usage.
             sb-grovel's README is no more.

        ... sb-bsd-sockets: It had to learn to use aliens instead of
            non-typechecked lisp arrays. I hope there are no memory leaks.
        ... ditto for sb-posix.

        Thanks to vja for patches & patiently testing my changes on
        x86 and SPARC.