[FEniCS] TAO configuration

[Garth N. Wells]

TAO has recently been merged into PETSc-dev, so to keep things simple I 
propose that we drop support for TAO as an optional dependency package 
and just configure it via PETSc. This means for now that users of 
DOLFIN-dev will need to use PETSc-dev to access TAO, and from the next 
PETSc release TAO will be available to all users who configure DOLFIN 
with PETSc. 

Let me know if you object to the proposed change.

Garth


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