Fix a couple of bugs in PATHNAME; reindent primitives.
Restablish (pathname-name #p"...") => "..." behavior which was broken with [svn r12485]. Fixes ABCL.TEST.LISP::LOTS-OF-DOTS.. MERGE-PATHNAMES fixed for jar-file pathnames referencing a hierarchial jar entry. JAR-FILE.MERGE-PATHNAMES.5 now tests for this case. Stack-friendly primitives normalized (reluctantly) to the Hungarian-style notation ("pf_function") introduced by Ville.
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