Update to README.cray

[reviewed by Greg]

Re-org and clean up due to merging READMEs, general update with new
information and retiring of old information.



git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@22046 3a8e244f-b0f2-452b-bcba-4c88e055c3ca
Cleanup of the NPB graph files.  [trivial]

Basically, condensed the individual size graph
files into a single .graph file per benchmark, while still preserving the
separate display per size.



git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@22047 3a8e244f-b0f2-452b-bcba-4c88e055c3ca