fix a memory leak with the ISF_PunchThroughTools

Tong Qiurequested to merge
tqiu/athena:mptmemoryleak into master

Add a destructor for the PDFcreator and PunchThroughParticle classes. Free PunchThroughParticle objects in the ISF_PunchThroughTools tool.

Edited by Tong Qiu

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