[Fix clojure-emacs#589] Don't preference home directory resources to …

…tramp by default.

Rename `cider-use-local-resources` to `cider-prefer-local-resources` and
set default value to nil.

Rename `cider-emacs-or-clojure-side-adjustment` to `cider-file-path` for
clarity (and brevity!).

cider-interaction.el

@@ -50,8 +50,8 @@
 (defconst cider-doc-buffer "*cider-doc*")
 (defconst cider-result-buffer "*cider-result*")
 
-(defcustom cider-use-local-resources t
-  "Use local resources under HOME if possible."
+(defcustom cider-prefer-local-resources nil
+  "Prefer local resources under HOME if available."
   :type 'boolean
   :group 'cider)
 
@@ -504,13 +504,13 @@ Removes any leading slash if on Windows."
           (t
            resource))))
 
-(defun cider-emacs-or-clojure-side-adjustment (resource)
-  "Fix the RESOURCE path depending on `cider-use-local-resources`."
+(defun cider-file-path (resource)
+  "Return the client or server RESOURCE path using `cider-prefer-local-resources'."
   (let ((resource         (cider-home-prefix-adjustment resource))
         (clojure-side-res (concat (cider-tramp-prefix) resource))
         (emacs-side-res   resource))
     (cond ((equal resource "") resource)
-          ((and cider-use-local-resources
+          ((and cider-prefer-local-resources
                 (file-exists-p emacs-side-res))
            emacs-side-res)
           ((file-exists-p clojure-side-res)
@@ -523,7 +523,7 @@ Removes any leading slash if on Windows."
 Adjusts for HOME location using `cider-home-prefix-adjustment'.
 Uses `find-file'."
   (let ((large-file-warning-threshold nil))
-    (find-file (cider-emacs-or-clojure-side-adjustment filename))))
+    (find-file (cider-file-path filename))))
 
 (defun cider-find-resource (resource)
   "Find and display RESOURCE."
@@ -532,7 +532,7 @@ Uses `find-file'."
         ((string-match "^\\(jar\\|zip\\):file:\\(.+\\)!/\\(.+\\)" resource)
          (let* ((jar (match-string 2 resource))
                 (path (match-string 3 resource))
-                (file (cider-emacs-or-clojure-side-adjustment jar))
+                (file (cider-file-path jar))
                 (name (format "%s:%s" jar path)))
            (switch-to-buffer
             (or (get-file-buffer name)