affects all the GPU models except RS.

Reorder Methodology (5.1) a bit.
Edits still incomplete.

Shrink graphs to 4cm from 5cm.

Moved graph traversal to the design section.
Make the graph traversal translate one annotated subgraph at a time,
instead of one leaf node (though the subgraph is first collapsed into
a leaf node in an unspecified manner).
Explain why in/out attributes are useful using stencil.

to be motivated accurately.

Add new bib entries to two bib files.

Removed bogus references.bib entry from bib command.