+ - Sensible tree-printout
+ - make Tib.Block extend Tree<>
+ - refine TIB
+ - documentation markup
+
+ - more natural phrasing of metagrammar?
+
+ - finalize metagrammar and rdp-op's
+
+ - Lay down the law on the different kinds of Sequence productions
+ and how they work.
+
+ => mydrop
+ => mylift
+
+ - Deal with the problem of zero-rep productions and whitespace insertion
+