#30 std::size is assumed where size_type should be used

[Michael Stevens]

Containers and Storage are parameterised by a size_type.
All uBLAS Containers and algorithms should be generic
and make use of this.

Presently the follow area still use a fixed std::size_t

1. The IB index base to compressed and coordinate types
2. Non mutable Containers like zero_vector
3. Expression functors

[Michael Stevens]

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1. IB seems reasonable as we expect base to be small and size_type to support +/- size_t for IB correction.
   compressed and coordinate types need a change to template parameters so difference_type can be passed. IB could go and be replaced by row_major_1 etc
2. Fixed
3. Expression functors have been fixed. No more size_t in functional.hpp