CL:DIRECTORY semantics for symbolic link resolution inverted and fixed.
The default for the :RESOLVE-SYMLINKS keyword to CL:DIRECTORY has changed from T to nil, meaning that naked DIRECTORY calls should never return an error for dangling symlinks. Thanks to Marco Antoniotti, Alan Ruttenberg, and Alessio Stallo for clarifying a reasonable position vis a vis ANSI. Addresses <http://abcl.org/trac/ticket/340>.
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