Modified graph code
Modified graph code

- Simplified the data structures to just using plain arrays (most algorithms
  still are written in the old style, so they will have to be modified)
- Added Ford-Fulkerson code

M4573R/pc-code,lbv/pc-code,lbv/pc-code,M4573R/pc-code,M4573R/pc-code,lbv/pc-code