Printing a CLASS with no proper name will now show its identity too.
Point out a mistake in the FORMAT interpreter.
Make WRITE work throughout COLD-INIT.

Progress reports are now possible without #!+sb-show.
If you put at toplevel for example
  (progn (write-string "Hey there: ") (write *info-types*))
this works as expected, subject to a few cautions:
  - doesn't work prior to package-init
  - might crash on structures, or not
  - output stream is not particularly efficient
  - and unsupported for win32
Define SINGLETON-P earlier