Adding electron mode data samples for Lb2Lll angular analysis (supersedes !1121)

Zhenzi Wangrequested to merge
zhenzi/RD_Lb2Lll_angular into master

Process electron mode data samples in order to create tuples for the angular analysis of the Lb2Lee mode. Same script have been successfully used for MC samples. Supercedes old merge request !1121 (closed) (that was incomplete/not merged).

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