Parallel Reduction bits

[Jules Bergmann]

This patch does the following:

* Implement and test get/put for distributed blocks.

* Implement an 'assign_local' function to convert between distributed 
and local views; implement a Working_view_holder to either create a 
local copy of a distributed view or an alias of a local view.

* Modify solvers (lu, qr, svd, toepsol) and signal processing objects to 
use assign_local and/or working_view_holder.

* Refactor reductions to use general dispatch.  Implement an evaluator 
for parallel reductions.

* Add missing traits and functions so that scalars can be used in 
parallel expressions.

* Have random to return views that can be used in local or distributed 
contexts.

                            -- Jules
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