Rename 'NewOcean' theme to 'Linuwial'

CHANGES.md

doc/invoking.rst

ghc.mk

haddock-api/haddock-api.cabal

haddock-api/resources/html/Linuwial.std-theme/linuwial.css

haddock-api/resources/html/Linuwial.std-theme/synopsis.png

haddock-api/src/Haddock/Backends/Xhtml/Themes.hs

html-test/ref/A.html

html-test/ref/Bold.html

html-test/ref/Bug1.html

html-test/ref/Bug195.html

html-test/ref/Bug2.html

html-test/ref/Bug201.html

html-test/ref/Bug253.html

html-test/ref/Bug26.html

html-test/ref/Bug280.html

html-test/ref/Bug294.html

html-test/ref/Bug298.html

html-test/ref/Bug3.html

html-test/ref/Bug308.html