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Update tracks and vertices prefilters for Charm exclusive lines

Nico Kleijne requested to merge nkleijne/update_prefilters into master

The Charm exclusive lines D^0\rightarrow hh' and D^0\rightarrow K_Shh' base their displacement selection on IP rather than IPChi2. This MR request makes sure (IP OR IPChi2) is used in the tracks and vertices prefilters.

The new filter for tracks would add roughly 7% more secondary vertices.

See also !1161 (merged) for some discussion and motivation.

FYI: @mamartin @lpica @mimorell

Edited by Nico Kleijne

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