New custom fields proposal

[Gervase Markham]

> Why 32K?  A "text" column, which would be the natural choice for a "long,
> but not TOO long" string, has a maximum length 64K characters.  Did you have
> some other column type in mind, or did you misremember the maximum size of a
> "text" column?  Or did you mean to restrict the size for other reasons?

The second one :-) My point, indirectly, was that we have a bug open on 
reducing the number of mediumtexts in Bugzilla in favour of texts.

Gerv