New stuff

[cchalmers]

Not ready to merge.

New Measure

The new measure is now a specialised Reader. Since a Data instance couldn't be derived I've had to change how measures are implemented:

• New MAttribute that holds Measured things. The Transformable instance scales the local parts.
• When compiling, these MAttributes are turned into normal Atributes using the global and normalised scales.
• Backends no longer have to extract output measures (so they all need changing).
• No more Data instances needed for n.

Other changes

• New OpacityGroup annotation, backends can implement similar to -svg's Href.
• Style now uses HashMap which should be faster and doesn't rely TypeRef's non-unique show instance.

[jeffreyrosenbluth]

Do all of the backends need changes?

[cchalmers]

Small ones. They'll need to remove any fromMeasures and SizeSpec might be slightly different.

They won't need to implement from OpacityGroup but I think most backends could support it.

[jeffreyrosenbluth]

OK, It might be a good idea to mention this in the PR,
since merging it will break other packages.

On Sun, Oct 12, 2014 at 12:07 PM, Chris notifications@github.com wrote:

Small ones. They'll need to remove any fromMeasures and SizeSpec might be
slightly different.

They won't need to implement from OpacityGroup but I think most backends
could support it.

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