Changed MDF compression to use ROOT ZLIB instead of the default (@clemenci)
In ROOT 6.14 the default changed from ZLIB to LZ4, and this change ensures reproducibility across versions of ROOT.
Cherry picked from !1380 (merged) on master
In ROOT 6.14 the default changed from ZLIB to LZ4, and this change ensures reproducibility across versions of ROOT.
Cherry picked from !1380 (merged) on master