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Fix some broken links (Trac #15733) [ci skip]

Summary:
Fix old trac links
https://phabricator.haskell.org/D5259

Test Plan:
Manually verify links

GHC Trac Issues: #15733

This means that old `test` flags can be passed in to `new-test`, `new-build`, `new-install`,
`new-configure`, etc. These new flags are:

    * `--test-log` (see old `--log`)
    * `--test-machine-log` (see `--machine-log`)
    * `--test-show-details` (see `--show-details`)
    * `--test-keep-tix-files` (see `--keep-tix-files`)
    * `--test-options`
    * `--test-option`

This fixes #4803, #4643, #4766, and #5416.

Add 'optional-target' field to plan.json

I prefer the convention that omitted boolean JSON fields default
to being `false`. Also, "target" makes it a bit more evident
this is about CLI targets.

Having this enables tooling to give better error messages when build output is
missing. cabal-install can choose to include optional components in the build
plan even though they weren't requested explicitly by the user. Currently
tooling would have to assume missing build output after a `v2-build all` call
means the component is currently disabled, which is just not very clean.

Remove 'do' in 'instance Text ModuleRenaming'

Compile profiling library for use with GHCi when both
`--enable-profiling` and `--enable-library-for-ghci` are passed.

The merged `HS${package}.p_o` file can be loaded instead of
`libHS${package}_p.a` when we run GHCi with
`-prof -fexternal-interpreter` to speed up the linking time.

This follows the same idea in ghc side:
https://phabricator.haskell.org/D5169
and is required to support same feature when building ghc
with hadrian as it uses `cabal copy`:
https://phabricator.haskell.org/D5270

This is actually implemented.

Suppress warnings in autogenerated signatures.

We used to only transliterate coding failures on Windows, but this can
fail on other platforms as well, e.g. when `LANG=C` is set on Linux.
We have done this in ghc for all platforms:
https://phabricator.haskell.org/D4642

Before, following commands will fail

```
$ LANG=C cabal install base-compat --verbose=3
Finalized package description:
...
(c) 2014-2018 Jo<stdout>: commitBuffer: invalid argument (invalid character)
```

and now finishes without problem, and print

```
(c) 2014-2018 Jo?o Crist?v?o,
```

instead.

Issue #5677 demonstrates one way for warnings to be produced by dummy
signatures. Autogenerated code really ought to never be generating
warnings, under any sets of flags provided by the user; this patch
uses the big hammer of entirely disabling warnings for the generated
signatures.

Fixes #5677.

Remove unused Semigroup imports.

allow network 2.8

fixes #5639

Cleans up the `-Werror` check, adds GHC 8.6.1 support and also filters RTS flags, fixing #5575

Due to a bug in ghc, some unused imports do not yield warnings.
This commit will remove such unused imports in preparation for
the ghc bug fix (see https://ghc.haskell.org/trac/ghc/ticket/13064).

Don't install anything if --dry is used

Tell the user about --lib when new-installing a package with no exes

Track the exact source of ghc-*-options related warnings

Link to 'developing packages' from new-build docs.

Enable bootstrap script to download and use local unpacked dependencies

Fixes #5667

* bootstrap.sh can use local tarball, this change enhances it by using
  the unpacked local directory if that exists, so it's possible to play
  with a patch of a dependency locally.
* a flag `--no-install` is added, so we can fetch and unpack all
  dependencies without actually installing them. this will allow us to
  later patch or build standalone cabal offline.

This reverts commit 9d217525.

I don't know where that 'let' came from :-/

Make store path absolute