Generated .htaccess files should have a trailing line break

Problem/Motivation

To comply with the Drupal coding standards the generated .htaccess files in the public and private files directories should end in a trailing \n character.

All text files should end in a single newline (\n). This avoids the verbose "\ No newline at end of file" patch warning and makes patches easier to read since it's clearer what is being changed when lines are added to the end of a file.

From Indenting and Whitespace

The comment about "No newline at end of file" probably isn't relevant as you wouldn't be patching generated content, but it is slightly confusing when you use the cat .htaccess command there is no new line before the next command.

Patches for D8 and D7 are attached.

Steps to reproduce

Proposed resolution

Adds the new lines where relevant and change writeFile() to include a newline.

Remaining tasks

Update to 10.0 and sort out test failures

User interface changes

API changes

Data model changes

Release notes snippet