Patch from Vladimir Sedach who notes that the ERROR-P argument to ACL's
EXCL:NAMED-READTABLE has changed to default to TRUE.  Add an explicit
NIL where necessary for correct behavior.

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* Fix readtable-iteration bugs on Allegro and SBCL

* Add some more tests

* Update documentation

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* The recent addition of empty readtables broke named-readtables
  fundamentally. Thanks for David Crawford for pointing that out.

  I had to accomodate MERGE-READTABLES-INTO now that the neutral
  element is no longer the standard readtable, but an empty
  readtable.

* We no make the readtable empty first when redefining it via a
  DEFREADTABLE form. Then the content is refilled.

* MERGE-READTABLES-INTO now signals a new error
  READER-MACRO-CONFLICT if a macro character is present
  in more than one of the argument readtables.

  DEFREADTABLE turns READER-MACRO-CONFLICT into a warning.

* Fix expansion of DEFREADTABLE so calls to MERGE-READTABLES-INTO
  properly quote readtable names.

* Add WITHOUT-PACKAGE-LOCK for our :AROUND method of PRINT-OBJECT
  specializing on READTABLE.

* Update docstrings accordingly.

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