auto-completion of Q-Register names, goto labels and help topics

 * Using a common implementation in RBTreeString::auto_complete().
   This is very efficient even for very huge tables since only
   an O(log(n)) lookup is required and then all entries with a matching
   prefix are iterated. Worst-case complexity is still O(n), since all
   entries may be legitimate completions.
   If necessary, the number of matching entries could be restricted, though.
 * Auto completes short and long Q-Reg names.
   Short names are "case-insensitive" (since they are upper-cased).
   Long specs are terminated with a closing bracket.
 * Long spec completions may have problems with names containing
   funny characters since they may be misinterpreted as string building
   characters or contain braces. All the auto-completions suffered from
   this problem already (see TODO).
 * This greatly simplifies investigating the Q-Register name spaces
   interactively and e.g. calling macros with long names, inserting
   environment registers etc.
 * Goto labels are terminated with commas since they may be part
   of a computed goto.
 * Help topics are matched case insensitive (just like the topic
   lookup itself) and are terminated with the escape character.
   This greatly simplifies navigating womanpages and looking up
   topics with long names.

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