Nyall Dawson efb84ea2fa [FEATURE][diagrams] Add optional legend entries for diagram sizes
A new "legend" tab has been added to diagram properties, allowing
both the existing attribute legend and a new size legend to be
enabled/disabled. The size legend has a configurable marker
symbol.

Also includes unit tests for both diagram attribute and size
legends.

Sponsored by ADUGA
2016-04-19 08:16:05 +10:00
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