Added some fun stuff, fixed up some roxygen junk, peek_top now errors for empty stacks, and added peek_top<- (which also errors if emtpy).
Added rpqueueb, a version using delayed assigned rstacks rather than lazy lists. This will replace the original in the next commit.
Updated the rpqueue to the final version using delayedAssign(), cleaned up documentation, passes almost all of check() now except for something about head() that I can't seem to figure out.