Fix list_view() and aid() debugging tools.

* In list_ast() - a helper to list_view():
 - eliminated extraneous indentation+ID printouts
   when the viewed nodes are not in AST;
 - elimnated an extraneous newline at the end of a C for loop
 - when printing ArgSymbol's blocks, annotate which ones they are

* In aid(), safeguard against accidental invocation on 1
  and other small numbers, while at it.
  Motivation: if I invoke nprint_view et al. on aid(1) by accident,
  the debugger prints the entire program, which is too much.

  I added aid09(), which is aid() without this safeguard.

* Remove #include "view.h" in a couple of .cpp files
  where it is used unnecessarily.

  I spot-checked each of these files to ensure that "view" and "aid"
  are not used even under some #ifdefs.