For package P,
"ghc-pkg unregister --user P" drops the global package if P is not in user.
"ghc-pkg unregister --global P" drops the user package if P is in user.
"ghc-pkg unregister --package-conf=<dir> P" drops the user or the global
package, preferring the user one, if P is not found in <dir>.
Same with "ghc-pkg --user unregister P", "ghc-pkg unregister P --user", etc.
GHC versions 6.10, 6.12, 7.0, 7.2.
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