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Status of new Expression interface

 

Looks like the new Expression interface might be working now but more
tests are needed. Please help out getting all the demos over to the
new interface.

The changes to the interface are as follows:

1. V=V argument in Expression should be removed

2. mesh argument in Constant should be removed

3. Subclasses of Expression overloading eval must overload dim if not
scalar

The Poisson and elasticity demos have been moved and both work.

--
Anders

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