Comments in Shen
One flaw in Qi II and Qi I was that comments were made using \ ..... \ which meant
that comments could not themselves be commented out and the syntax clashed with that for characters
which also used \. Shen follows the convention of starting comments with \* and ending with *\.
Versions 10 and after allowed for single line comments: \\ will blank out all the input before
the next RETURN or newline.