* eval.c (s_bad_define): New static identifier.

	* eval.c (s_bad_define): New static identifier.

	(m_body): Fixed comment.

	(scm_m_define): Don't generate memoized code for definitions that
	are not on the top level.  As a consequence, no memoized code at
	all is generated for definitions any more: Top level definitions
	are executed immediately during memoization and internal
	definitions are handled separately in m_expand_body.

	(scm_unmemocopy, unmemocopy): Removed code for unmemoizing
	definitions.  Consequently, there is no unmemoizing code any more
	that might modify the environment.  Thus, the old scm_unmemocopy
	is removed and the old unmemocopy is renamed to scm_unmemocopy.

	(SCM_CEVAL): The SCM_IM_DEFINE keyword can no longer occur in
	memoized code.  Call EVALCAR for continuations.  Prefer !SCM_NULLP
	over SCM_NIMP in places, where the argument is known to be part of
	a proper list.