Created a basic structure for sql tool widget.
Minor adjustments on sql tool widget.
Defined the final layout for sql tool.
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.
Minor adjustments on DatabaseImportForm's import execution progress.
Added support to save/load sql commands on SQL tool widget.
Added support to copy/export results to CSV.
Added methods getType getTypeId to BaseType and getSQLTypeName to
PgSQLType as an alternative to call operatores ~, ! and *.

Added a menu to handle object deletion and data viewing on sql tool.
SQL tool now is fully functional.

Fix bug related to geometry type (issue #399)

Minor change when generate .stacktrace file for crash handler.

Minor fix on logical expressions evaluation on SchemaParser
Updates for release 0.7.0-alpha
Merge branch 'sql-tool' into develop