2.016.1: Fixes for ABCL, GCL; tweaks for LispWorks and CCL.
Use probe-file for probe-file* in LispWorks. Make ABCL's jar translation happier with the recent compile-file-pathname* change for Stelian by redoing cfp myself. Make truenamize work when the merged pathname is relative. Makes it happier when e.g. the *default-pathname-defaults* is #p"", which is the case notably on CCL. Try and fail to support GCL 2.6 and have 2.7 fail less; too many bugs, in CONDITIONs, PATHNAMEs, and more, plus compiler bug that breaks coerce-pathname.
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