[Ecls-list] patch for namestring

[Dustin Long]

This attached patch fixes (namestring) which previously appended an 
extra period to pathnames with a non-nil, yet blank, type
example:
before: (make-pathname :name "hi" type: "") => "hi."
after: (make-pathname :name "hi" type: "") => "hi"
before: (make-pathname :name "." type: "") => ".." ; huge problem for 
(truename)
after: (make-pathname :name "." type: "") => "."

Dustin
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