o check usage of -a, -! and the like instead of displaying the ugly
    "Internal error: syntax error ..."

- rename _parse_media() into parse_media() for next commit

  o fix fallback on hdlist when xml-info not found

  o fallback on hdlist when xml-info not found (useful for old distribs)

  o fix --synthesis

  o add special code for --files simple case, it makes urpmf 3x faster for
    this often used case

- urpmf, urpmq:
  o use xml info instead of hdlist when possible
    o "urpmq -l" is faster (3x)
    o "urpmf -l" is slower (1.5x)
    o "urpmf --sourcerpm" is much faster
    o see "xml-info" option in urpmi.cfg(5) to see when those files are downloaded
    o new require: perl module XML::LibXML
- urpmq:
  o use rpm file instead of hdlist/xml-info when file is local
  o use URPM::Package->changelogs (need perl-URPM 3.06)
- urpmi.update, urpmi.addmedia, urpmi.removemedia:
  o drop hdlist support replaced with xml media_info
    (this imply file-deps are correctly handled, see genhdlist2(1))
- urpmi.addmedia
  o new --xml-info option

and remove duplicated list (nb: conf_files has been added to command-line, but
this won't hurt afaik)