这两个是只装一个就行么？我装的是gtags，但是快捷键对应的也都是helm-xxx的函数。之前装的helm-gtags也对应同样的函数。
没看明白什么关系。

另外，装gtags的时候，spacemacs 最新dev分支启动后，总是提示这样的信息：

spacemacs/helm-gtags-define-keys-for-mode does nothing! python-mode doesn’t have to call it anymore.
spacemacs/helm-gtags-define-keys-for-mode does nothing! go-mode doesn’t have to call it anymore.
spacemacs/helm-gtags-define-keys-for-mode does nothing! c-mode doesn’t have to call it anymore.
spacemacs/helm-gtags-define-keys-for-mode does nothing! c++-mode doesn’t have to call it anymore.
spacemacs/helm-gtags-define-keys-for-mode does nothing! rust-mode doesn’t have to call it anymore.
spacemacs/helm-gtags-define-keys-for-mode does nothing! js2-mode doesn’t have to call it anymore.
spacemacs/helm-gtags-define-keys-for-mode does nothing! emacs-lisp-mode doesn’t have to call it anymore.
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