Add support for retina display mac
Merge pull request #397 from novawave/retina

Add support for retina display mac
Merge branch 'develop' of https://github.com/pgmodeler/pgmodeler into sql-tool
Major change on DatabaseImportForm. The code responsible to list
databases and objects was moved to static methods in order to share them
with other classes without need to instantiate a DatabaseImportForm.