add optional pyconf NTupleSvc basket size, requires gaudi/Gaudi!1648
Customise the Branch BasketSize for FunTuple creation to reduce 'many-trees' in a single Analysis production memory consumption.
Requires LHCbIntegrationTests!84 (merged) and Gaudi v38r1p1 (see gaudi/Gaudi!1648 (merged) and lhcb-core/LHCbNightlyConf!1263 (merged))
Edited by Marco Clemencic