Dynamic .gexf graphs

Made the edge size and node weight time-sensitive {weights as
dictionaries}. The big changes, basically, are that 1) the citational
data elements are always  dictionaries now, not lists 2) the count
increments are stored in these dictionaries. Downsides: runs slower,
outputs slightly different edge/nodes counts than Caren's original
(cannot figure out the cause of that latter point, but I do know that
ref_cite was inexplicably processing differently as well and needed to
be cleaned). I've also commented out the original's d3js and html
outputs. It wouldn't take much to adapt them to the new, time-sensitive
cocitational variables.