Allow qstr's with non-ident chars, construct good identifier for them.

Also, add qstr's for string appearing in unix REPL loop, gross effect
being less allocations for each command run.

py/qstrdefs.h

@@ -80,3 +80,11 @@ Q(sort)
 Q(join)
 Q(strip)
 Q(format)
+
+Q(<module>)
+Q(<lambda>)
+Q(<listcomp>)
+Q(<dictcomp>)
+Q(<setcomp>)
+Q(<genexpr>)
+Q(<stdin>)