Fixes #4761

Signed-off-by: Edward Z. Yang <ezyang@fb.com>

ghstack-source-id: 957ba1db25747ffb08ad8b9a4af1f9310d8e738d
Pull Request resolved: https://github.com/haskell/cabal/pull/7306

Fix typo

Fix typos

Propagate provenance when parsing ProjectConfig

In a project with lots of constraints it's not always obvious from
which file a constraint is coming from. Also we are currently showing
a big `TODO` message in place of the file name which is not nice.

Prior to this patch

```
$ cabal build all
Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: some-package-0.24.1.2 (user goal)
[__1] trying: foldl-1.4.8 (dependency of some-package)
[__2] next goal: mwc-random (dependency of foldl)
[__2] rejecting: mwc-random-0.15.0.0 (constraint from project config TODO
requires ==0.14.0.0)
[__2] trying: mwc-random-0.14.0.0
[__3] next goal: math-functions (dependency of mwc-random)
[__3] rejecting: math-functions-0.3.4.0, math-functions-0.3.3.0,
math-functions-0.3.2.1, math-functions-0.3.2.0, math-functions-0.3.1.0,
math-functions-0.3.0.2, math-functions-0.3.0.1, math-functions-0.3.0.0,
math-functions-0.2.1.0, math-functions-0.2.0.2, math-functions-0.2.0.1,
math-functions-0.2.0.0, math-functions-0.1.7.0, math-functions-0.1.6.0,
math-functions-0.1.5.2, math-functions-0.1.5.1, math-functions-0.1.4.0,
math-functions-0.1.3.0, math-functions-0.1.1.2, math-functions-0.1.1.1,
math-functions-0.1.1.0, math-functions-0.1.0.0 (constraint from project config
TODO requires ==0.3.4.1)
[__3] fail (backjumping, conflict set: math-functions, mwc-random)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: mwc-random, math-functions, foldl,
some-package
Try running with --minimize-conflict-set to improve the error message.
```

Note the TODO. No idea where th constraint is coming from :(

With this patch applied:

```
Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: some-package-0.24.1.2 (user goal)
[__1] trying: foldl-1.4.8 (dependency of some-packagge)
[__2] next goal: mwc-random (dependency of foldl)
[__2] rejecting: mwc-random-0.15.0.0 (constraint from project config
/Users/a602232/git/haskell-libs/cabal.project.freeze requires ==0.14.0.0)
[__2] trying: mwc-random-0.14.0.0
[__3] next goal: math-functions (dependency of mwc-random)
[__3] rejecting: math-functions-0.3.4.0, math-functions-0.3.3.0,
math-functions-0.3.2.1, math-functions-0.3.2.0, math-functions-0.3.1.0,
math-functions-0.3.0.2, math-functions-0.3.0.1, math-functions-0.3.0.0,
math-functions-0.2.1.0, math-functions-0.2.0.2, math-functions-0.2.0.1,
math-functions-0.2.0.0, math-functions-0.1.7.0, math-functions-0.1.6.0,
math-functions-0.1.5.2, math-functions-0.1.5.1, math-functions-0.1.4.0,
math-functions-0.1.3.0, math-functions-0.1.1.2, math-functions-0.1.1.1,
math-functions-0.1.1.0, math-functions-0.1.0.0 (constraint from project config
/Users/a602232/git/haskell-libs/cabal.project.freeze requires ==0.3.4.1)
[__3] fail (backjumping, conflict set: math-functions, mwc-random)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: mwc-random, math-functions, foldl,
some-package
Try running with --minimize-conflict-set to improve the error message.
```

Note that we now explicitly say where the constraint is coming from!

Don't create spurious dirs on init

Reference ghc-9.0 in 3.0 changelog as that's what 8.12 became.

Reference ghc-9.0 as that's what 8.12 became.

Add changelog.d documentation

Moved info for cabal install --lib to sub-heading

The text for the --lib flag to the cabal install subcommand has been
moved to its own subheading.

Also the text has been slightly reworded.

Remove Win GHC-8.8.4 and GHC-8.10.2 jobs

Add GHC-8.10.3 Windows CI job

Issue 7234: other-extension cannot be omitted.

When cabal-version is old.

Fixes https://github.com/haskell/cabal/issues/7234

Paths no missing safe haskell mode

Otherwise enabling `-Wmissing-safe-haskell-mode`
would cause annoying warnings.

Remove outdated sections from READMEs

Use alex-3.2.6

Add missing spaces between words in output

Cabal: Improve cmdline help readability by breaking long lines

Currently usageInfo lays out the cmdline help as three columns for each
OptDescr: 1) the short options, 2) the long option and 3) the help text.

We try to fit these columns in 79 chars but if thi fails we allocate at
least 30 chars to the help text. Since we currently have some very long
.. long options in cabal-install this makes the help output quite ugly on
a standard 80x24 terminal window.

This patch does two things: firstly we get rid of the dedicated short
options column, and simply merge this with the long options
column. Secondly instead of laying everything out in a strictly two column
fashion with the first column having variable width we instead make the
first column a fixed width and simply break the line after the list of
options if we go over.

Say we currently have:

    -a  --short-long-option                                 with some help text
        --really-long-option=with|a|bunch|of|allowed|values and help text here

Instead we now get:

    -a, --short-long-option       with some help text
    --really-long-option=with|a|bunch|of|allowed|values
                                  and help text here

where the help text is aligned to a fixed column (30 chars here) throughout
and we use a comma to separate the short and long options instead of giving
the short options a dedicated column.

Fix cabal init name deduction

Make license files field SymbolicPath

Add Win GHC-8.10.2 job