Rewrote SLEEP (and added SLEEP-UNTIL) so that it doesn't hang up signal

delivery in C code.

We now ,open floatnums in ,user so that users won't lose on flonum code.

Makefile.in

@@ -116,6 +116,7 @@ SCSHOBJS = \
 	scsh/regexp/regexp.o \
 	scsh/regexp/regsub.o \
 	scsh/select.o scsh/select1.o \
+	scsh/sleep1.o \
 	scsh/syscalls.o scsh/syscalls1.o \
 	scsh/time.o scsh/time1.o \
 	scsh/tty.o scsh/tty1.o \
@@ -641,7 +642,10 @@ scsh/scsh.image: $(VM) $(SCHEME) $(CIG).image
 	 echo ",translate =scheme48/ $(LIB)/"; \
 	 echo ",in scsh-level-0"; \
 	 echo "(%install-scsh-handlers)"; \
+	 echo "(autoreap-policy 'early)"; \
 	 echo ",user"; \
+	 echo ",load-package floatnums"; \
+	 echo ",open floatnums"; \
 	 echo ",open scsh"; \
 	 echo "(dump-scsh \"scsh/scsh.image\")") \
 	| ./$(VM) -o ./$(VM) -i $(CIG).image