Merge branch 'jc/clone'

* jc/clone:
  Move "no merge candidate" warning into git-pull
  Use preprocessor constants for environment variable names.
  Do not create $GIT_DIR/remotes/ directory anymore.
  Introduce GIT_TEMPLATE_DIR
  Revert "fix testsuite: make sure they use templates freshly built from the source"
  fix testsuite: make sure they use templates freshly built from the source
  git-clone: lose the traditional 'no-separate-remote' layout
  git-clone: lose the artificial "first" fetch refspec
  git-pull: refuse default merge without branch.*.merge
  git-clone: use wildcard specification for tracking branches

merge-recursive.c

@@ -1272,7 +1272,7 @@ int main(int argc, char *argv[])
 	struct commit *result, *h1, *h2;
 
 	git_config(git_default_config); /* core.filemode */
-	original_index_file = getenv("GIT_INDEX_FILE");
+	original_index_file = getenv(INDEX_ENVIRONMENT);
 
 	if (!original_index_file)
 		original_index_file = xstrdup(git_path("index"));