### Macroprocessor: fix priority of operators

- == and != have now lower priority than <= < >= >, for consistency with the Dynare modelling language (and incidentally C and C++, but not Julia). - ^ has now higher priority and no associativity, for consistency with the Dynare modelling language (and usual arithmetic notation). - & has now higher priority than |, and both have lower priority than + and -, but higher than inequality comparators. This is not the same as C and C++ (in which & and | are just above && and ||), but this allows for expressions such as "a|b == c" to have their most natural semantics (i.e. this will compare the union of a and b with c; the C/C++ priority level would have resulted in a type error). Ref #5.

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