Interactive Javascript + Canvas (jqPlot) powered graphs

[Andy Clayton]

Hi all,

I finally had some time to sit down and clean this up a little. Given 
that I am lazy I also switched from Flot to jqPlot because it supports 
more of what Gnucash needs without changes or unsupported extensions. 
There still is a decent amount of work to be done to reach parity with 
the gog charts, but I wanted to post what I have so far if anyone would 
like to try it out and comment. For now I left the old charts in for 
comparison. Once things are in a bit better shape I'll make a bug and 
post the latest patches.

Here is a list of at least some of the possible issues I am aware of:
* The default coloring could probably be better (plus support for when 
specific colors are specified)
* The legend needs to get out of the way of the graph
* On bar graphs as more bars get packed in there seems to be too much 
padding compared to bar width (really small bars with lots of whitespace)
* On any of the bar graphs over time the x-axis labels are (to me) 
misleading. A bar labeled 01/01/2011, for example, actually represents 
the value up to the next x position, say 01/02/2011. Perhaps labeling it 
with the through date (the inclusive end date) would make more sense, 
rather than the start? Then again, maybe that is just a matter of 
preference. Or maybe I will avoid the issue entirely by simplifying the 
labels to just year, or month and year, for the simple cases.

Anyways, feel free to give a try and let me know what could be different 
or better.

Thanks,

Andy
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