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Test suite: canonicalize binary path before execution

This reverts commit 6bfb5a20.

The sandbox feature is already documented (see #1430).
Additionally, the documentation added in this commit is misleading:
'runhaskell Setup.hs sandbox CMD' doesn't work.

Build selected test suites and benchmarks only

Issue #1451. Passes the extra arguments to 'cabal test' or 'cabal bench'
to the build phase so that only the requested test suites or benchmarks
are built.

Added known extensions: OverloadedLists, EmptyCase, AutoDeriveTypeable, ...

Added known extensions: OverloadedLists, EmptyCase, AutoDeriveTypeable, NegativeLiterals, NumDecimals, NullaryTypeClasses

Fixes #1450.

See #1447.

Some people have old snapshots of 1.17 installed, which causes build failures.

platform, rather than assuming HOST == BUILD. This fixes things for cross compiling.

Comparison was using (>) instead of (>=). Bug introduced in 272a5c2c.
Fixes #1443.

This means that the package tests will pick up whatever GHC was passed
on the

    cabal configure --enable-tests -w some-ghc

command line.

Ignore 'ghc-options' when parsing 'ghc --info' output.

Pass linker options when loading *libraries* in GHCi.

Fixes #1438.

Fixes #1439. See also #1435, which fixed this for executables.

Conflicts:
	Cabal/Cabal.cabal

The flag `-outputdir` sets `-odir`, `-hidir`, `-stubdir`, and `-dumpdir`.

Using `-outputdir` has the benefit of redirecting all output files with
only one flag to a temporary directory.

Cabal currently only sets the first three but not the `-dumpdir` flag for
compiling Haskell modules, which clutters the top-level package directory
and sometimes dump files get overwritten if their names collide for
different build targets.

This minimal commit merely adds the `ghcOptOutputDir` flag to the data
structures and enables its use for the compilation of Haskell modules. A
later commit may remove the use of the now redundant `ghcOptStubDir` and
`ghcOptHiDir` flags in favor of the new `ghcOptOutputDir` flag.

The flag `-outputdir` is available since GHC 6.10; see also
ghc/ghc@bb074cb7 and
http://ghc.haskell.org/trac/ghc/ticket/2295