[cl-unification-devel] Updated patch to cl-ppcre integration

[Pixel // pinterface]

This replaces my previous patch to cl-ppcre.lisp.

In addition to the previous functionality changes/bug fixes, it converts
'unify to use #'cl-ppcre:scan-to-strings, which simplifies the logic
somewhat.  It also fixes a bug involving unbound register groups.  That is:

  (match (#T(regexp "(foo)(bar)?baz" (?x ?y)) "foobaz")
    (values x y))

will now return

  "foo", nil

rather than signaling a type-error.
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