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Reverse resolution of graph's pngs has been replaced with
calls to graph.get_draw_url(). Directly referencing these
pngs is not necessary since the get_graw_url() returns
the '/draw/static' mapping which caches the pngs as well.

This new function implements the previous functionality that
views/api:link() had. It no longer uses 'Links' objects to
resolve a node link, but directly searches for the required
'Graph' object. Then, if the 'separate' argument is provided,
calls graph_for_each interface' to get all the separate graphs
that form this aggregation, otherwise just returns the png of
the aggregate graph using a reverse url resolution of 'get-png-data'.

Function has been altered to use the newly implemented logic.
The aggregate graph (Total)  is aquired with a reverse call
to get-png-data. Parameters start, end have been removed
as we do not want to create graphs dynamically any longer.

The logic of this function was split among 2 different files.
This simplifies / moves the whole logic to views/utils.py

This alters the 'script.js' file. Changed the produced title for
node link panel.

This reverts commit e9a217ab.