This commit was manufactured by cvs2svn to create branch
'graph_devel_1_33_0'.

svn path=; revision=25737
Added several algorithms:
  - random graph layout
  - Fruchterman-Reingold layout
  - A* search
  - Floyd-Warshall all-pairs shortest paths

Fixes for several algorithms:
  - Documentation for Johnson all-pairs shortest paths
  - Bellman-Ford single-source shortest paths

svn path=; revision=25738
No need to * Floyd-Warshall

svn path=; revision=25775
Removed old branches.

svn path=; revision=38550