Fix #6082: Use pseudo-NonEmpty

Rename generate(s) to be greppable

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Simple.SrcDist: Fix search for DistPref

Previously we would look at directly at the sDistDistPref flag. However,
this may not be set, resulting in #6068. We should rather be using
findDistPrefOrDefault to find the DistPref directory.

Pass `@...` as a literal argument if the response file does not exist and support recursive response files

Update installing-packages.rst

Corrected a typo.

Improve error message for 'new-test' command

Fix spelling error

Suggest adding '--enable-tests'. [ci skip]

[ci skip]

Fix datadir path in generated `Paths_` file

Fixes #6050.

Fixes #5986.

Fix typo in "Unexpected response" message

[ci skip]

dyn_js_hi -> js_dyn_hi
dyn_js_o  -> js_dyn_o

Add autogen-includes field

autogen-includes aren't searched nor packages by `sdist`.

This is relatively small code patch, but there are
- change in file-format
- short documentation of the field
- `cabal check`
- test-suite noise due new field in `BuildInfo`

Add autogen include directories for inplace packages

Local packages may have include heades in
- `inplaceDir </> d` (bundled, in source tree)
- `inplaceDir </> libTargetDir </> d` (autogenerated, somewhere in
  builddir)

We need both, for dependant packages to work.

The simple reproduce case is to have `unix` and `process`
locally in the project and try to build `process`.

Update ghcjs

Fixes #6032.

Stop using Data.Monoid.{First,Last}