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Fixes #2139.

Rename --install-base-libraries to --allow-boot-library-installs.

Qualified constraints: documentation and unit tests (issue #3502)

Add IsString instance for ShortText newtypes

Added Arbitrary instance for UserQualifier.

Added more test cases for user constraint parsing.

I also moved all the detail about constraint syntax that was in
the Nix-style local build cabal.project section into the section
on the --constraint command line option. This reduces some
duplication of information.

Add whitelist hspec-discover

Only build haddock for foreign libraries if requested

We did parse but did not yet use the --foreign-libraries flag for cabal
haddock.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Qualified constraints (issue #3502) part 2

Remove makeAbsolute

Prefixed all constructors of Qualifier with 'Qual' to make it
easier to grep them.

Renamed 'Unqualified' to 'Toplevel'.

Restore jobs parameter to travis-script.sh

I also removed 'unqualified' from PackagePath.hs and replaced all
uses of it with 'scopeToplevel'. The meaning is identical,
however 'scopeToplevel' is a less confusing name.

Add flag to allow the dependency solver to install any package (issue #4209).