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Computes the sections of an ideal sheaf supported on the excptional locus.

a list of pairs (V,n), where V is a string which identifies the blowing up center that gave rise to the exceptional component in question using the Villamayor function value that characterizes the center in the resolution process. The natural number n gives the exponent of the factor of the sheaf supported on the selected exceptional divisor. By default the exponent is 0.
The procedure assumes that chartHistory contains the chart tree of a computed seqence of blowing ups and puts the sections of the computed ideal sheaf into the SCS entries of the charts of the covering of the final blowing up variety.
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