Add more generic ground symbols
Often there may multiple grounds separated just for noise reasons. There could be a few ohms or a bead between them, for example. They aren't specifically GNDA or GNDD or GNDS, just a partition of a common ground. So here are a three symbols to assist with that.
All contributions to the kicad library must follow the KiCad library convention
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Provide a URL to a datasheet for the symbol(s) you are contributing -
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Check the output of the Travis automated check scripts - fix any errors as required -
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