#6 resize with preserve only implemented for dense

[Michael Stevens]

The correct preserve sematics are a recent addition to
uBLAS. These have so far been implemented for the
types vector and matrix and other simple types like
unit_matrix etc. The sparse types are missing or
implementations are will fail to preserve.

[Michael Stevens]

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Also function signatures in documentation for sparse need
updating

[Michael Stevens]

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As of Boost 1.33.0 all documentation has corret function
signatures