debug also displays sys lib dir.
Supporting GHC 7.8's unicode quote.
fixing typos.
refactoring.
added -g option to ghc-modi
Merge pull request #215 from exFalso/ghc-modi-flag

added -g option to ghc-modi
fixing the fallback mechanism for info.
removing unnecessary code.
style change.
info/type does not require module name.

Fallback was removed. See #199.
refactoring.
refactoring.
just style.
simplifying modSummary.
removing depanal.
clarifying Ghc and IO.
refactoring.
Using Options.
Refactor the way packages databases are handled

- cradle now stores a list of active package databases instead of only
  the user store (if present).

- rename `cradlePackageDb` -> `cradlePkgDbStack` as that`s what the ghc
  documentaion calls this kind of thing

- `getPackageDbPackages` now returns names of all visible packages in
  the given directory. Also the implementation now uses `ghc-pkg`
  instead of manually looking at the package database
Only add available package to ghc options

Fixes #185