RNTuple fixes - writing dynamic attribs and setting compression
2 fixes for RNTuple format: 1 - the compression will be set to match the one of the hosting TFile (before it was always set to the default 101) 2 - dynamic attributes will be actually written out now (the detection of AuxStore in the collection was not working right)
Should not affect TTree format at all.
Edited by Marcin Nowak