fixed operator precedence list

 * necessary since in SciTECO every operator has a different
   precedence. E.g. successive additions/subtractions cannot
   be evaluated from left to right (by their associativity).
   Perhaps this should be changed.
 * subtraction must have a higher precedence than addition,
   since (a+b)-c == a+(b-c)
 * division must have a higher precedence than multiplication
   since (a*b)/c == a*(b/c).
   This is not quite true for integer arithmetics.
 * this fixes expressions like 5-1+1 which were counterintuitively
   evaluated like 5-(1+1)

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