"description" and "comment" datatypes unnecessarily limited to 255 char

"description" and "comment" fields are restricted to 255 char.  However after some research I found that all the supported databases support longer then 255 char

I would expect users to want to write more then 255 char in a comment (I know I personally can).

I have included diff of my proposed solution as a attachment  (I am unfamiliar with the procedures for submitting patches here)

A discussion has been started on dev ML: https://markmail.org/message/7utrgejc2c44i37u