Correct typo in rose date documentation.
Merge pull request #1222 from arjclark/rose_date.correct_documentation

rose date: correct typo in documentation.
rose.config_processors.file: improve table create

Check whether required tables exist, instead of whether the database
file exists.
Also fixed various problems reported by pylint.
Merge pull request #1225 from matthewrmshin/fix-file-install-bad-db-schema

rose.config_processors.file: improve table create
Update CHANGES.md
rose.date: fix invalid local name
Merge pull request #1226 from matthewrmshin/fix-rose-date-typo

rose.date: fix invalid local name