Merge branch 'js/remote-improvements'

* js/remote-improvements: (23 commits)
  builtin-remote.c: no "commented out" code, please
  builtin-remote: new show output style for push refspecs
  builtin-remote: new show output style
  remote: make guess_remote_head() use exact HEAD lookup if it is available
  builtin-remote: add set-head subcommand
  builtin-remote: teach show to display remote HEAD
  builtin-remote: fix two inconsistencies in the output of "show <remote>"
  builtin-remote: make get_remote_ref_states() always populate states.tracked
  builtin-remote: rename variables and eliminate redundant function call
  builtin-remote: remove unused code in get_ref_states
  builtin-remote: refactor duplicated cleanup code
  string-list: new for_each_string_list() function
  remote: make match_refs() not short-circuit
  remote: make match_refs() copy src ref before assigning to peer_ref
  remote: let guess_remote_head() optionally return all matches
  remote: make copy_ref() perform a deep copy
  remote: simplify guess_remote_head()
  move locate_head() to remote.c
  move duplicated ref_newer() to remote.c
  move duplicated get_local_heads() to remote.c
  ...

Conflicts:
	builtin-clone.c

cache.h

@@ -805,7 +805,7 @@ struct ref {
 #define REF_HEADS	(1u << 1)
 #define REF_TAGS	(1u << 2)
 
-extern struct ref *find_ref_by_name(struct ref *list, const char *name);
+extern struct ref *find_ref_by_name(const struct ref *list, const char *name);
 
 #define CONNECT_VERBOSE       (1u << 0)
 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);