[GNU Crypto] Cascade Cipher API (long)

[Raif S. Naffah]

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hello there,

here is a first cut of the Cascade API, with a proof-of-concept 
(TestOfCascade).

things i'm not sure, or not 100% convinced, about are:

* the way to initialise a cascade;
* whether to call the operational state State or Direction;
* whether the State is an attribute of the Stage or that of a 
Stage-in-Cascade.;
* there's a real benefit in exposing an IStage interface;
* there's a need to implement cloning;
* there's a benefit in offering a way to "flatten" a cascade.


cheers;
rsn
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Cascade.java
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IStage.java
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Stage.java
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CascadeStage.java
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ModeStage.java
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State.java
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TestOfCascade.java
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