Style update

Remove unnecessary quotes from document examples.
Remove bad trailing spaces.
Consistent header
Merge pull request #1027 from matthewrmshin/style

Style update
metomi/rose#1028: fix launcher bug for unknown configuration
Merge pull request #1029 from benfitzpatrick/1028.rose-edit-fix-file-browser-unknown

#1028: fix file browser launch bug for unknown configuration
rose bush: do not apply prettify to normal files
metomi/rose#955: add rose edit support for optional source content
metomi/rose#955: rose edit: file page: preserve optional
rose bush: fix prettify call
Merge pull request #1031 from benfitzpatrick/rose-bush.no-prettify-default

rose bush: do not apply prettify to normal files
Update CHANGES.md
Merge pull request #1033 from benfitzpatrick/955.rose-edit-file-ignored-source-content

#955: rose edit: support file optional source content
metomi/rose#1034: fix orphaned warning
Update CHANGES.md
metomi/rose#928: rose edit: update sub-ns API
metomi/rose#928: tidy
metomi/rose#928: more tidy
rose edit: fix optional source bug
metomi/rose#1036: rose edit fix enable empty user-ignored section
Merge pull request #1038 from benfitzpatrick/rose-edit.fix-optional-source

rose edit: fix optional source bug