* helm.el (helm-map): Issue #402 Disable mouse click.
* helm-mode.el (helm-comp-read): Enable keymap from source also.
* helm-command.el (helm-M-x): Use helm-map.
* helm-files.el (helm-source-find-files): Enable keymap from source.
* helm.el (helm-map): Issue #402 Prevent also drag events.
* helm-help.el: Fix read-file-name doc.