initial work at fixing aliases support:

- kill struct alias, struct expandnode is used instead
- introduce map_parse_alias() and map_parse_virtual()
- aliases and virtual code no longer assume db(3) but use the map API which
  lets them become backend agnostic AND value-checked. this actually makes
  the code simpler by removing all values parsing from aliases.c
- rename K_SECRETS -> K_SECRET, K_ALIASES -> K_ALIAS for consistency the
  enum has singular names.
- aliases, virtual and forward now work with an expandtree and deal with
  multiple levels of resolving by merging expandtree's

more coming soon ;)

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