Increase the length of the IDA / Workflows / Name field to, say, 255 characters

Recent workflows have long names. When these are loaded into the database, these are truncated to 30 characters because that's hard-coded as the length of the relevant field. I don't think there's any reason for that to be so restrictive. Can we relax it to, say, 255 characters instead?

While we're at it:

• Let's make the same change for the other models in that file (Ida, Facility).
• It feels like description should be a TextField rather than a CharField (certainly, that would make editing in the admin interface more convenient).