Visitor interface for the dfs algorithm.

small svn:ignore fixups

Faster implementation

If the file does not exist LemonReader throws exception

Upgrading tests

Removing old input/output functions

Filename can be given as std::string

Show description of the file

Some modifications on shortest path algoritms:
- heap traits
- checked execution

Bug fix in connectedComponents
Strongly connected components

Computing the number of the connected components and the components themselves.

Euler tour iterator.

Newly created map is realized by the property givening by common sense.

Doxyfile for documenting glemon's architecture.

New version of XML reader/writer.
Now, there are only a single XmlIo class both for reading and writing.

- dijkstraZero() added. (Until we conclude how to handle the related problem.)
- processed() query function added.

MapSelector widget is able to pop up NewMap window. At the moment I hope MapSelector widget is done.

Bugfix

Mapselector widget reached its first release, but there are still work to do on it, I know...

Minor changes and bugfixes

Removing signal/commit Change from alteration notifier

It makes slower the change Target/Source functions
and used only by the In/Out DegMap

Updating tests

Doc and changing heap

Doc bugfix