graph_io under construction
This is a working version, but needs more improvments.

todo:
documention + fix the file format
improve the exception system

add some possible asserts

tutorials

 BINARIES = bfs_test min_cost_flow

 INCLUDEDIRS= -I../.. -I.. -I../{athos,klao,marci,jacint,alpar,johanna,akos} 

 include ../makefile