Work around for truncated database names

The "monetdb status" command truncates long database names such that they fit
on your terminal (or, if you're not running on a terminal, so that they fit
within 80 characters). TKP-web then attempts to use the truncated names, and
fails.

By using the long-format status we can work around this. It's still fragile,
though, as we're relying on parsing unstable command line output.
Tweak plot layouts

- No longer label each bar in "number of sources per image" with the bar
  height and the image timestamp: this doesn't scale to large numbers of
  images, rendering the plot unreadable.

- Tweak the layout of "scatter of individual sources" such that the axis
  labels don't fall off the plot.
Merge pull request #25 from jdswinbank/plot-layout

Tweak plot layouts
Merge pull request #24 from jdswinbank/long-status

Work around for truncated database names