Clean up cider-popup.el and cider-jar.el for standalone use

These two modules have no CIDER-specific dependencies and can be
used independently by other Emacs packages.

- cider-jar.el: Fix cider-jar-clojars-url to use the artifact name
  instead of hardcoding "cider-nrepl" in the URL path
- cider-eval.el: Remove unused (require 'cider-jar)
- Update commentary in both files to document their standalone nature

Author: bbatsov

lisp/cider-eval.el

@@ -52,7 +52,6 @@
 
 (require 'cider-client)
 (require 'cider-common)
-(require 'cider-jar)
 (require 'cider-overlays)
 (require 'cider-popup)
 (require 'cider-repl)

lisp/cider-jar.el

@@ -21,8 +21,10 @@
 
 ;;; Commentary:
 
-;; Dealing with JAR (Java archive) files, which are really just zip files in
-;; disguise.  In particular downloading and retrieving the cider-nrepl jar.
+;; Generic JAR (Java archive) file handling - downloading, caching,
+;; listing contents, and extracting files.  JARs are really just zip
+;; files in disguise.  This module has no CIDER-specific dependencies
+;; and can be used by any Emacs package that works with JVM artifacts.
 
 ;;; Code:
 
@@ -43,7 +45,7 @@ This provides an efficient check to see if a file exists in a jar or not.")
 GROUP, ARTIFACT, and VERSION are the components of the Maven coordinates."
   (concat "https://repo.clojars.org/" group "/" artifact "/"
           version
-          "/cider-nrepl-"
+          "/" artifact "-"
           version
           ".jar"))
 

lisp/cider-popup.el

@@ -19,7 +19,9 @@
 
 ;;; Commentary:
 
-;; Common functionality for dealing with popup buffers.
+;; Generic popup buffer management for displaying temporary content.
+;; This module has no CIDER-specific dependencies and can be used by
+;; any Emacs package that needs popup buffer functionality.
 
 ;;; Code: