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Also fix some warnings to make it work.

See #2323 for the details.

(cherry picked from commit 370f135a)

Pretty print the fields of flags nested.

Consolidate default values and make flag pretty-printing use them.
Allow code to work with non-boolean defaults.

- Remove redundant space after `description:` field name.
- Eliminate trailing spaces on *some* blank lines.
- Convert all field names to lower case.
- Eliminate redundant `buildable: True` and `exposed: True` fields.
- Fix Haddock module comment.

Added the new field constructor functions 'listFieldWithSep'
and 'commaListFieldWithSep' to be able to define pretty printing
for fields, where each value of the field is positioned on a new line.

Which fields are nested is currently hard coded in the 'ppField' function.

(cherry picked from commit e8d5ea25)

Added the new field constructor functions 'listFieldWithSep'
and 'commaListFieldWithSep' to be able to define pretty printing
for fields, where each value of the field is positioned on a new line.

Which fields are nested is currently hard coded in the 'ppField' function.

This reverts commit fdf8afce.

Fixes #1771.

The list constructors 'nestedListField' and 'nestedCommaListField'
have been added and are now used for fields that should be pretty
printed with nesting.

This reverts commit 0038d05a, reversing
changes made to c721e851.

This reverts commit 68d9077c.

Now the 'fieldGet' function of 'FieldDescr' does the
whole pretty printing of the field. Previously only the
values have been pretty printed by 'fieldGet' and the
name of the field with the colon have been printed
in the 'PrettyPrint' module.

But this separation made it more difficult to handle the
pretty printing of fields differently, because some fields
should be just printed in one lines and others - having several
values - should be printed nested with each value on a new line.

This difference in the printing of the fields is now handled by
the 'FieldDescr' constructor functions in 'ParseUtils'.

Now the 'listField' and 'commaListField' functions create 'FieldDescr'
that nest their values and all other functions create one line
for the whole field.

It's just noise that duplicates information in the 'LICENSE' file.

Issue #1202. The pretty printer was printing 'type: -' for empty test
suite interfaces.  The empty test interface type is the result of
parsing a branch in a conditional block where no type is explicitly
specified (i.e., the type is inherited from a higher level or propagated
up from a lower one).  Therefore, the pretty-printer should not print
any 'type' field at all for test suites with an empty test interface
type.

Makes things a little simpler in GHC's build system if libraries are in
the same directory as their name.

At the top level we now have cabal/ and cabal-install/

This patch adds the 'testEnabled' field to TestSuite. It's 
undesirable to track build status information in the static package 
description, but there is no better solution at this time. This 
patch has the side-effect of fixing several TODOs in 
Distribution.Simple.Configure.