Speed up 0663 upgrade script

Speed up 0663 upgrade script

Move update to the end

This ensures most of the rest goes without error first

Disable triggers on the table before doing update

This speeds the update up significantly as we don't need to re-calc the
additional column's new data.

Allow new column to be null (at first) with no default

This allows the column to be added *without* re-writing every row. We still
re-write every row with the update, but at least we aren't doing that
*twice* this way.

And add the not null/default to new column and re-enable triggers as our
last action.

Signed-off-by: Thomas Berezansky <tsbere@mvlc.org>
Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>