Fixed a bug on the reverse engineering process that was wrongly
migrating 'timestamp with time zone' data type as 'timestamp' only.

Fixed a bug on the reverse engineering process that was preventing the
migration of operator classes / indexes that contain duplicated
elements.

Changed the 'line color' attribute of relationships to 'custom color'

Added an option on the database import process to generate random colors
to relationships.
Merge branch 'db-import-improvement' into develop