test for piecewise functions
isdifferentiable(expr, var, class)
isdifferentiable(expr, var, class, varparam)
number n telling if the expr is in class Cn
isdifferentiable determines if the expression expr containing piecewise or piecewise functions such as abs, signum, max, ..., is of class C^ class. It returns either true or false.
The optional argument varparam can be passed to the function and in case expr is not of class Cn, varparam contains information of which Cn class the function is, and a list of points where we have discontinuities in the n+1-th derivative.
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