[lang] Mutable* increment decrement, add and subtract

[Stephen Colebourne]

I would like to add the following methods to the Mutable* number classes
- increment
- decrement
- addValue(int/short/...)
- addValue(Number)
- subtractValue(int/short/...)
- subtractValue(Number)

Only question is whether we should try to catch overflow conditions or 
not. That could get quite complex.

Stephen

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