Overhaul of umat building and instantiation process.

Comments
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o Multiple source files supported
o Initial state properly sent during initialization of umat
o Warning of negative values in Jacobian changed to warn of
  negative eigenvalues
o SMISES state variable saved for all materials
Update to abaqus umat wrappers.  Also added SMISES as output variable.

I really need to document the abaqus umat capability...