* riece.el (riece-save-variables-files): Place ";;; Do not edit

* riece.el (riece-save-variables-files): Place ";;; Do not edit
this file!" at the beginning of ~/.riece/save.

* riece-server.el (riece-reset-process-buffer): Make
riece-filter-running local to the server buffer.
* riece-filter.el (riece-filter): Allow only a message handler to
run at a time.
* riece-globals.el (riece-filter-running): New variable.