class ZNameMap: public ZList, public ZGlass::NameChangeCB

 Keeps a parallel multi-map with elements sorted by their name.
 This is used both to have faster "by-name" search and to
 allow for lists sorted by name.

 Registers itself to each element of the map to receive name-change
 callback. This mechanism is rather flawed - it should be extended
 significanly to become bullet-proof:
   - name-change and consumer registration should be locked (per queen?);
   - name-change notifications should be sent as MIRs;
   - the sun copy should handle all this, moon copies should be updated
     by special MIRs;
   - all this implies that name-change registration would only be done at
     the sun.
 Oh, also, the insertions should be done at the sun with some more specific
 MIR being sent to the moons.

 The bKeepSorted flag enforces that the list remains sorted by name
 most of the time (the request is sent via a MIR). This is primarily
 intended for GUI views. This could also be improved with the above changes.