[PATCH]: Precedence

[Waldemar Kornewald]

Hi,
this is the `math macro and generic Precedence class for reordering a
syntax tree using any precedence rule.
It is not complete, though: macros and messages with optional parameters
are not recognized and it cannot yet understand that
2 ^ 3 ^ 4 = 2 ^ (3 ^ 4)

The list of math symbols is not complete, either, but that is trivial to
extend. I wanted to finally send this code before extending it.

Bye,
Waldemar
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