Metalinks Code

now handles the mirrorlists section for better segmented downloading

downloading now works for jigdo files, still need to assemble ISO

Added initial support for conversion of .jidgo to .metalink (not quite complete), downloading still in progress

Updated for 4.1 release, includes a few bugfixes based on running the automated tests

Real file download progress being reported for non-segmented downloads now

Real file download progress being reported now, not just block increments

Better display of bitrate when at megabit level

Added cancel checks to more places for faster stopping and less likelihood for errors, bugfix for downloading non-metalink files (default piece size)

sync with new metalink object methods from appupdater

Cancel callback fix