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Make --enable-documentation work

Apply global config to all packages

Haddock support for '--ghc-options'

Support Haddock's hyperlinker

Adds the ability to generate haddock documentation for non-inplace
package builds.

In other words this allows

  - `$ cabal new-build --enable-documentation`
  - `$ echo "documentation: true" >> cabal.project && cabal new-build`
  - `echo "documentation: true" >> ~/.cabal/config && cabal new-build`

And it will generate (and install) haddock documentation for any
package.

packages whether they are local to the project or not.

Add more new-freeze integration tests.

'--ghc-options' flags are passed all the way through to Haddock.
In the process, 'argGhcOptions' is no longer a 'Flag' and no longer
requires a bogus GHC version (Haddock will handle those issues).

Fixes #4613. If a new enough version of Haddock is being used,
`--hyperlink-source` will run via Haddock's `--hyperlinked-source`
instead of going through HsColour.

Replace flag-defaulting hack by proper solution

Addresses  #4737 and  fixes #5139

This commit also moves part of the new-freeze build tools test into the new
test.

If we have a cabalFilePath, just invoke the configure script there.  Otherwise
try to invoke it locally to the CWD.  But don't try to shell out in a different
directory, that would mess up the paths.  In general we want to run
/path/to/configure from the bulid directory (e.g. outside of the package folder).

# Conflicts:
#	Cabal/Distribution/Simple.hs

Update bootstrap.sh

Don't ignore goal order parameter when generating summarized solver log.

The test still passed with the misspelled flag name, because it was only used to
force a goal order, and the goal order didn't need to be fully specified.

After #5012, the solver generated the summarized log by using a goal order that
preferred goals from the final conflict set.  It completely ignored the original
goal order parameter.  This caused a failure in one of the unit tests that set a
goal order and then checked the summarized log, when the solver's goal order
changed for other reasons (See #5012).

This commit combines the two goal orders, with the goal order that prefers goals
from the conflict set taking precedence over the original goal order.

See #4737

This reverts commit 1e90ae43.

See #4737

This reverts commit 71131cf4.

See #4737