Changing parameter order in exception classes + improvements

Simplifying exceptions

- Using asserts instead of exceptions for unitialized parameters
- Only the IO exceptions are used in the lemon
- DataFormatError is renamed to FormatError
- The IoError is used for file access errors

Use DEBUG instead of ASSERT in graph extenders (ticket #17)

Use proper traits class in visitor based algorithms

Merge

Improvements related to BFS/DFS/Dijkstra (ticket #96)
- Add run(s,t) function to BfsVisit.
- Modify run(s,t) functions in the class interfaces to return bool value.
- Bug fix in Dijkstra::start(t) function.
- Improve Dijkstra::currentDist().
- Extend test files to check named class template parameters.
- Doc improvements.

Remove the BOOST copyright notice from lemon/concept_check.h
as it no longer applies there.

Make chg-len.py independent from the global Mercurial config files

Merge

Using from-to order in graph copying tools + doc improvements (ticket #150)

Merge

Remove todo-s and convert them to trac tickets

Merge

Improve the function-type interface of bfs, dfs, and dijkstra (ticket #96)
- BfsWizard and DfsWizard have run(s), run(s,t), and run() functions,
DijkstraWizard has run(s) and run(s,t) functions.
- Set NodeMap<T> instead of NullMap as PredMap and DistMap in the default
traits classes for the function-type interface.
- Modify the related test files.
- Doc improvements.
- Bug fix in concepts/path.h.

Removing fixme an log assert handler from assertion system

Merge

Merge

Use only a single (cached) variable to hold the version number.

Better versioning (#144)

Python script for computing the longest path in the revision tree

Merge

doc/named-param.dox was missing from doc/Makefile.am

Improvements in named-param.dox (ticket #147)

Improvements in named-param.dox

Port named-param.dox from svn -r3504

Use __func__ only if the compiler supports it (ticket #148).

Merge

Merge

Make copy constr and op= of the default maps private (ticket #137)

Update NEWS file (ticket #121)