Minor compilation fix on Windows.
Minor form adjustments on ConstraintWidget.ui
Minor form adjustments on indexwidget.ui
Fixed a crash when remove a view linked tables.

Minor fix on view's reference code generation.
Minor fix on function editing form when handling the result table
columns. The variadic field is disabled on the parameter form.
Minor fix when generate the string that denotes the assigned constraints
to a column
Removed attributes and methods that were responsible to control columns/

Added attributes and methods on table to control indexes of relationship
added columns and constraints.
Create routine to restore columns/constraints positions.
Fixes the bug that was changing the columns positions whenever a
relationship was edited on the model (issue #449).

Custom  indexes for columns and constraints added by relationships are
now stored on tables. In previous version the relationship was the
responsible for that but this approach was wrongly provoking the bug
related on issue 449.

Remove unused parser attributes and commented old code.
Minor improvement on Table::restoreRelObjectsIndexes()
Merge branch 'fix449-cols-custom-pos' into develop
Added a basic routine the check if there is some new version on
pgModeler site. The method makes a request to a specific url passing the
current app version and the must recent version is returned compared to
the passed one.
Changed the update notifier from a standard message box to a more
elaborated floating widget.

Added an option to disable update checking at startup.
Update on CHANGELOG.md and README.md for release 0.7.2-alpha
Merge branch 'update-check-feature' into develop
Minor fix on Windows deployment script.
Minor fix on Windows deployment script
Minor fix on Linux deployment script.
Minor fix on semantics of one-to-one relationship. When one of the
tables are of mandatory participation the fk columns must not accept
null values.
Minor appearance improvement on textbox editing form.