mfs: Remove outdated comment
mfs: Share one MfsFile for all file hook calls related to a specific file.
mfs: Add internal function mfsPackageFromPackage()
mfs: Add mfsFileOwningPackagesCount() and mfsFileOwningPackage()
mfs: Changed FileList parameter to Package parameter for recurseDir() and addFile()
mfs: Add mfsFileGetOriginalDestination() which returns original destination package for the file