Major improvements in the graph output code. Mostly adding more

Major improvements in the graph output code.  Mostly adding more
options, making existing options more visible and dealing with
holes in data better.

util/stats/barchart.py:
    - move the options for BarChart to a base class ChartOptions so
    they can be more easily set and copied.
    - add an option to set the chart size (so you can adjust the aspect ratio)
    - don't do the add_subplot thing, use add_axes directly so we can
    affect the size of the figure itself to make room for the legend
    - make the initial array bottom floating point so we don't lose precision
    - add an option to set the limits on the y axis
    - use a figure legend instead of an axes legend so we can put the legend
    outside of the actual chart.  Also add an option to set the fontsize of
    the legend.
    - initial hack at outputting csv files
util/stats/db.py:
    don't print out an error when the run is missing from the database
    just return None, the error will be print elsewhere.
util/stats/output.py:
    - make StatOutput derive from ChartOptions so that it's easier to
    set default chart options.
    - make the various output functions (graph, display, etc.) take the
    name of the data as a parameter instead of making it a parameter to
    __init__.  This allows me to create the StatOutput object with
    generic parameters while still being able to specialize the name
    after the fact
    - add support for graph_group and graph_bars to be applied to multiple
    configuration groups.  This results in a cross product of the groups
    to be generated and used.
    - flush the html file output as we go so that we can load the file
    while graphs are still being generated.
    - make the proxy a parameter to the graph function so the proper system's
    data can be graphed
    - for any groups or bars that are completely missing, remove them from
    the graph.  This way, if we decide not to do a set of runs, there won't
    be holes in the data.
    - output eps and ps by default in addition to the png.
util/stats/profile.py:
    - clean up the data structures that are used to store the function
    profile information and try our best to avoid keeping extra data
    around that isn't used.
    - make get() return None if a job is missing so we know it was
    missing rather than the all zeroes thing.
    - make the function profile categorization stuff total up to 100%
    - Fixup the x-axis and y-axis labels.
    - fix the dot file output stuff.
util/stats/stats.py:
    support the new options stuff for StatOutput

--HG--
extra : convert_revision : fae35df8c57a36257ea93bc3e0a0e617edc46bb7