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+- optimize the search trees. Right now, we have 81812 calls to make_id
+  for 14601 packages, resulting in 7420560 calls to comp_id.
+
+  There can be at most 2 new identifiers per package (package name and
+  version), so a perfectly balanced tree should have a depth of no more
+  than 14. If we assume that each call to make_id searches to the bottom,
+  we'd get 1145368 calls to comp_id, about 15% of the current number.
+
+  So the tree is clearly degenerated.
+
+
+- check whether introducing a new package would cause a conflict
+
+- compile the list of conflicts of installed packages
+
+- handle Provides:
+
+- if there are multiple choices, try to prefer more recent versions
+
+- sort prerequisites such that they can be installed in the specified order
+
+- consider Architecture:
+
+- what to do with explicit and implicit replacement ?
+
+- if we can't resolve the prerequisites, give at least a hint of what one
+  can do to improve the situation
+
+- check database for internal consistency
+
+- implement keyword search