Overall clean-up in maps.h

- Rename some map types:
* IntegerMap -> RangeMap
* StdMap -> SparseMap
* FunctorMap -> FunctorToMap
* MapFunctor -> MapToFunctor
* ForkWriteMap -> ForkMap
* SimpleMap -> WrapMap
* SimpleWriteMap -> WrapWriteMap
- Remove the read-only ForkMap version.
- Rename map-creator functions for the read-write arithmetic and
logical maps.
- Small fixes and improvements in the code.
- Fix the typedefs of RangeMap to work correctly with bool type, too.
- Rename template parameters, function parameters, and private members
in many classes to be uniform and to avoid parameter names starting
with underscore.
- Use Key and Value types instead of K and V template parameters in
public functions.
- Extend the documentation with examples (e.g. for basic arithmetic and
logical maps).
- Many doc improvements.
- Reorder the classes.
- StoreBoolMap, BackInserterBoolMap, FrontInserterBoolMap,
InserterBoolMap, FillBoolMap, SettingOrderBoolMap are almost unchanged,
since they will be removed.
- Also improve maps_test.cc to correctly check every map class, every
constructor, and every creator function.

 /* -*- C++ -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2003-2008

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 /**

 \page license License Terms

 \verbinclude LICENSE

 */