dependency aliases - updated version

[Auke Kok]

Attached this time a proper patch for theedge instead of a tarball against
the current CVS theedge (so not against the old aliases code).

some changes:

* added proper escapes for:
  - running from lvu (tree/stree)
  - first/second dependency run (only enters the interactive stage on the
    first run)
  - the second run uses the depends file because that shows the proper choice

* tested with non-installed alternatives properly

* prettyfied output

to see in the full glory you can sedit 'xservers-profile' to '%X' in
moonbase/*/DETAILS, or try adding an optional_depends '%MTA' '' '' ''  to
mailx for instance... those two cases pretty much cover the extreme cases.

sofar
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