Minor JavaDoc improvements
Change to 4284be4: now allow unlimited MIME length

I've decided to remove this restriction completely and store
as @Lob columns.
Identifier columns are now stored as @Lob in DB

This means we can handle long identifiers (a la Uniqurate)
without having to trim them. This is currently safe as the data is
only being stored for recording purposes.
TEMP! Removed valn check on identifier lengths.

This is to allow UQ questions with long identifiers to run.
Once we allow invalid assessments to run, I shall bring this
check back.
Ready for 1.0-DEV24