Fix DDB command "show map XXX": - Check that an argument is always available, otherwise current map   printing before to recurse is garbage. - Spit out a message if an argument is not provided. - Remove unread nlines variable. - Use an explicit recursive function, disassociated from the   DB_SHOW_COMMAND() body, in order to make clear prototype and recursion   of the above mentioned function.  The code results now much less   obscure.
Fix DDB command "show map XXX":
- Check that an argument is always available, otherwise current map
  printing before to recurse is garbage.
- Spit out a message if an argument is not provided.
- Remove unread nlines variable.
- Use an explicit recursive function, disassociated from the
  DB_SHOW_COMMAND() body, in order to make clear prototype and recursion
  of the above mentioned function.  The code results now much less
  obscure.

Submitted by:	gianni

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