#5 Need an Array module for common array functions

[Erick Tryzelaar]

This should be analogous to the List module, and provide such useful
things as folding, mapping, and etc.

-e

[Erick Tryzelaar]

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slicing would also be useful, though we'd have to figure out if we want a slice to
be a new array, or just a modifiable view into the array.

[John Skaller]

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Felix supports slicing syntax already, same as Python:

a.[first to last]

only using 'to' instead of ':', this is already used by the
string module. The associated function is called 'substr'.
It should return a new array for parameter value, and alias
a subarray if parameter is lvalue (same as C++ would do).

RTL already contains the required routine to convert
indicies into normalised 'start, length' format.