Create a basic structure to append/prepend sql on database model.
Minor fix on model export helper.
Minor change on object selector widget. User now can pass a list of
types (to constructor) that will be selectable on the view.

Function isTableObject moved from PgModelerNS namespace to TableObject
class.

Append SQL button added to objects editing form.
Added a basic code completion widget (keywords + model objects)
Code completion widget done. Pending code comment
CodeCompletionWidget class documentation done.

Added code completion to view, rule and function editing forms.

Minor fixes on object find method on DatabaseModel class.
Fixed package name generation on MacOSX deployment script.
SQL Append feature checkpoint.
SQL append form implementation done. Pending code documentation.
Added a feature to create sequences from serial columns. This not
applies to columns added by relationship.
Removed OID=FALSE when generating code of tables.

Minor change on column editing form.
Added a feature to break relationship lines in straight angles.

Added a feature to remove all user added points from relationship.
Minor info files updates for release 0.5.2
Added support to change font size on textboxes (issue #261)
Minor fix on CodeCompletionWidget. Added the correct modifier to popup
the completion on MacOSX

On pgsql type widget user can now select the desired type by typing the
name on "Type" field. The same is valid for "Spatial" and "Interval"
fields.
Info files update for release 0.5.2