r176387 - comment parsing. Keep the original command format

[jahanian]

On Mar 1, 2013, at 3:08 PM, Jordan Rose <jordan_rose at apple.com> wrote:

> For the record, Doxygen comments can also start with '@', probably for javadoc compatibility. Maybe HasAt?

Now split into  two commands, backslash_command and at_command. in r176401.

- Fariborz