Modify the implementation of ListDigraph::ArcIt (#311)

The new implementation is based on out-arc iteration (like
ListGraph::ArcIt) instead of in-arc iteration to make it
consistent with the documentation.

Much better implementation for node splitting (#311)
in ListDigraph. This solution is the same as the one that
is used in SmartDigraph. It is much faster and does not
invalidate any iterator like the former implementation.

Add a resize() function to HypercubeGraph (#311)
just like the similar functions in other static graph structures,
and extend the test files to check these functions.

Add reserve functions to ListGraph and SmartGraph (#311)
ListDigraph and SmartDigraph already have such functions.

Doc improvements, fixes and unifications for graphs (#311)

Doc improvements and unification for graph concepts (#311)

Copyright notices added to scripts

Simple interactive bootstrap script

Merge #298

Merge

Small improvements for NetworkSimplex (#298)

Add a parameter to control arc mixing in NS (#298)

Small improvements in NS pivot rules (#298)

Merge #302

Add creator functions for IdMap and RangeIdMap (#302)

Rename ValueIterator to ValueIt in graph maps (#302)
but keep ValueIterator as an alias in CrossRefMap
(only for reverse compatibility).

Extend maps_test.cc (#302)

Doc improvements for several graph maps (#302)

Merge

Improvements for graph maps (#302)

- Add a count() function to CrossRefMap.
- Add tests for IdMap and RangeIdMap.
- Extend tests for CrossRefMap.
- Improve the doc.

Merge

Also check ReferenceMapTag in concept checks (#312)

Merge

Small doc improvements (#304)

Merge

Rearrange modules (#303)

Small doc improvements

Merge

Unify member names in heaps (#299)

The following renamings are made.

Public members:
- UnderFlowPriorityError -> PriorityUnderflowError
("underflow" is only one word)

Private members:
- bubble_up() -> bubbleUp()
- bubble_down() -> bubbleDown()
- second_child() -> secondChild()
- makeroot() -> makeRoot()
- relocate_last() -> relocateLast()
- data -> _data
- boxes -> _boxes

Move the heaps to a separate group (#299)

Improve and unify the documentation of heaps (#299)
and avoid a warning in SimpleBucketHeap::operator[].

Merge

Much faster implementation for BinomHeap (#301)

Smarter bubbleDown() in K-ary heaps (#301)

Small improvements in heap implementations (#301)

Make K a template parameter in KaryHeap (#301)

Improve and unify the doc + names in the new heaps (#301)

Bug fix in PairingHeap::pop() (#301)

Add fourary, k-ary, pairing and binomial heaps (#301)
These structures were implemented by Dorian Batha.

Merge

Add negativeCycle() function to BellmanFord (#51)

Add a detailed test file for BellmanFord (#51)

Improvements and unifications for BellmanFord (#51)

- Rework the function type interface to fit to dijkstra().
- Rename named template parameters (Def* -> Set*).
- Rename some private member variables
(to start with an underscore).
- Simplify template parameter names.
- Many unifications and improvements in the doc.

Port Bellman-Ford algorithm from SVN -r3524 (#51)

Merge

Improvements for iterable maps (#73)

Port iterable maps from SVN 3509 (#73)

Merge