[BioC] What's new in the graph package

[Seth Falcon]

The graph package provides data structures and methods for
representing and computing on graphs (collections of nodes and edges).

Version 1.10.0, available in the Bioc 1.8 release (requires R 2.3.0)
includes a number enhancements as described below.

* Node and edge attribute handling improved and documented.  For
  details see
  http://bioconductor.org/packages/1.8/bioc/vignettes/graph/inst/doc/graphAttributes.pdf

* New way to create graphNEL instances

  We now accept two structures for the edgeL argument, a list similar
  in structure to that returned by edges(g) and a more complicated
  nested structure as documented for edgeL. 

* GXL improvements

  Node and edge attributes are now handled by fromGXL and toGXL.
  Fixes for writing undirected graphs.  

* Coercion methods improved

  Added graphAM <==> graphNEL coercion.  Speedup for matrix ==>
  graphNEL.

* Many other small bug fixes and improvements.