Mismatch between install and update schema

The latest changes to redirect.install have caused the schema for new and existing installations to diverge:

1. #2828083: Fields 'redirect_options', 'source_options' should be BLOB not TEXT → changed the type of redirect.source_options and redirect.redirect_options to "blob". The update hook applied an incomplete schema that discarded the "not null" declaration.
2. #2194099: Create database index on the redirect column → added an update hook that creates an index for redirect.redirect. The index is missing in redirect_schema().
3. #2057615: Increase size of source field to hold long URLs → increased the length for redirect.source and redirect.redirect to 900 characters. No update hook was added.