Also add a general disclaimer about the non-exhaustiveness of exception
listings in the documentation.

Fixes #94.

Morally revert b9d0d694

Fixes #95.

Seems LTS 2.x and 3.x are too old for Stack.

As of Stack v2, overriding Win32 in extra-deps now causes time to get
pruned (#4547), so we have to explicitly override time too.

Fixes #90.

Fixes #87.

This warning will soon be enabled by -Wall (See Trac #15656).

On the OS X instances of Travis CI, utimensat with mtime = UTIME_OMIT
will set atime to the current time instead of the given time.  This bug
seems to only affect Travis CI OS X but not OS X systems in the wild.

Fixes #86.

Fixes #85.

This restores the old behavior prior to 1.3.1.1.

The internals have been refactored to use "simplify" instead of
"normalise", the latter of which is a bit buggy on certain paths,
especially on Windows.  The Windows implementation of
prependCurrentDirectory has been rewritten to use GetFullPathName, which
knows how to handle drive-relative paths better.

The new emptyToCurDir function helps explicitly mark places where empty
paths are accepted.  So far, it is limited to canonicalizePath,
makeAbsolute, the permission functions, and the timestamp functions.

Fixes #84.

Actually fixes #83.

Fixes #83.

  - Migrate POSIX/Windows-specific functions to .Internal.Posix/Windows
  - Migrate generic utility to .Internal.Common
  - Add more helper functions for ListT
  - Migrate getCurrentDirectory from .Internal.Common to System.Directory
  - Migrate lookupEnv to .Internal.Prelude
  - Make System.FilePath exports in System.Directory explicit
  - Clean up preprocessor directives

See https://ghc.haskell.org/trac/ghc/ticket/15042.

See https://ghc.haskell.org/trac/ghc/ticket/15018.