Rename "search path" to "library roots"
* lisp/emacs-lisp/cl-seq.el (cl-set-difference): Retain the order of the elements from CL-LIST1. * test/automated/cl-lib-tests.el (cl-lib-test-set-functions): Update WRT to the above change. * lisp/progmodes/project.el (project-search-path-function): Rename to project-library-roots-function, update the documentation and references. (project-search-path): Likewise, to project-library-roots. (project-roots): Clarify documentation. (project-vc-search-path): Likewise, to project-vc-library-roots. (project-library-roots): In addition to the renames, thread the results through file-name-as-directory. (project-prune-directories): Accept a variable number of arguments. Rename to project-combine-directories. (project-subtract-directories): New function. * lisp/progmodes/elisp-mode.el (elisp--xref-find-references): Append project-roots and project-library-roots together. * lisp/progmodes/etags.el (etags--xref-find-references): Ditto.
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