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.

prefix=@prefix@

exec_prefix=@exec_prefix@

libdir=@libdir@

includedir=@includedir@

Name: @PACKAGE_NAME@

Description: Library for Efficient Modeling and Optimization in Networks

Version: @PACKAGE_VERSION@

Libs: -L${libdir} -lemon @GLPK_LIBS@ @CPLEX_LIBS@ @SOPLEX_LIBS@ @CLP_LIBS@ @CBC_LIBS@

Cflags: -I${includedir}