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TAYLOR should now always detect non-analytical expressions in
its first argument. As an example, consider the function 
that is not analytical in the neighborhood of 
: Trying
to calculate
taylor(x*y/(x+y),x,0,2,y,0,2);causes an error
***** Not a unit in argument to QUOTTAYLORNote that it is not generally possible to apply the standard REDUCE operators to a Taylor kernel. For example,
PART, COEFF,
or COEFFN cannot be used. Instead, the expression at hand has
to be converted to standard form first using the TAYLORTOSTANDARD
operator.
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