GXemul Code2

20071227 Adding StateVariable and StateVariableValue classes; writing
unit tests, etc.
The ActionStack now uses lists instead of vectors, for the
undo and redo stack. (For O(1) undo/redo operations.)
Continuing on the Component infrastructure: parent/child
relationships, state variables, and serialization.
Adding a simple Checksum class; useful as a helper for unit
tests.
20071228 Implementing a CreateComponent function, which when given a
"component class name" creates a Component.
Adding a simple EscapedString helper class, for generating and
decoding C-style escaped strings.
Simple deserialization works. :)

Some extremely minor Doxygen comment updates.

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NetBSD 4.0 has been released. Doing regression testing of all systems listed on guestoses.html.

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Fixing an alignment bug in dev_vga, when allocating 1 byte.

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Continuing on the ActionStack.

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