#16 uBLAS/valarray slice parameter order different

[Michael Stevens]

uBLAS defines the slice constructor:
slice (start, stride, size)

This is very unfortunate as valarray defines:
slice (start, size, stride)

Solution is to change uBLAS. This would SILENTLY break
any existing code.

To make the change clear at compile time. The new slice
should have a different name and the old deprecated.

[Michael Stevens]

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Medium term solution would be to introduce two
new slices.
aslice (start, size, stride)
bslice (start, end, stride)
At the same time a
arange (start,size) could be added