* Added 'DROPBOXES.SEGUE_LEVEL' and 'DROPBOXES.SEGUE_LENGTH' fields
to the database.
* Incremented the database version to 271.
* Applied a pull request from Dennis Graiani <dennis.graiani@gmail.com>
the added Segue parameters to the 'Edit Dropbox' dialog.
* Modified the 'Segue Length' control in the 'Edit Dropbox' dialog
to take mS as units.