Build fixes for building scigraph. Tested with sbcl/cmucl. Consisting mostly of: * Replacing (ignore x) with (declare (ignore x)). * Hide custom declarations in defmethod from sbcl/cmu that both choke on these. * Change defconstant on cons into a defvar, for recompilation sake. * Unwrap defpackage from eval-when. * Change the memoize macro to use load-time-value to generate a hash-table. -- Fruhwirth Clemens - http://clemens.endorphin.org for robots: sp4mtrap@endorphin.org