Added function makePDFBakExpPowMOverSq which is the default
MOverSq times an exponential with as argument a polynomial
added new function makePDFBakExpMOverSqExtd, which is an extension
of the default function used at the approval of 08/10/2013.
The expansion is (e^(p1*m)/(m-m0)) * (1/(m-m0) + p1*m +p2*m*m + ...)
Added makePDFBakExpMOverSqPow where
 order 0 is e^(p1*m)
 order 1 is e^(p1*m)/(m-m0)
 order 2 is e^(p1*m)/(m-m0)/(m-m0)
 order 3 is e^(p1*m)/(m-m0)/(m-m0)/(m-m0)
 and so on and so forth
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