[$] Removing support for DeltaRPMs in Fedora

Way back in 2009, we looked at the prestoplugin for yum, which added support for DeltaRPMs to Fedora. That packageformat allows just the binary differences (i.e. the delta) between aninstalled RPM and its update to be transmitted, which saves networkbandwidth; the receiving system then creates the new RPM from those two pieces before installing it. Supportfor DeltaRPMs was eventually added to the distribution by default, thoughthe feature has never really lived up to expectations-and hopes. Now, it would seemthat Fedora is ready to, in the words of project leader Matthew Miller,"give DeltaRPMs a sad, fond farewell".