Emulate tabs as 4 spaces

See #605

Conflicts:
	orbisgis-view/src/main/java/org/orbisgis/view/sqlconsole/ui/SQLConsolePanel.java
Merge pull request #640 from agouge/tabs

Emulate tabs as 4 spaces
See #605 and irstv/orbisgis-view-plugins#15.