Facelift for certain symbolizer interfaces.

* Rearrange panels into a 2x2 grid rather than all vertical
* Remove all colons
* Rename configuration --> settings
* Center text in drop-down menus
* Replace JNumericSpinner (OrbisGIS SIF) --> JSpinner (pure Java)
* Resize Simple Style Editor
* Right-align text fields
* Replace JTextField --> JFormattedTextField (with NumberFormat model)
  to verify input
* Remove unnecessary JPanels
* Put preview in its own (titled) panel and make background transparent
* Resize color previews
* Put checkbox next to its text; put color preview and checkbox on the
  same line
* Remove unnecessary qualifiers (e.g., Line width --> Width)
Merge branch 'master' into UI

Incorporates PRs 454, 455.

Conflicts:
	orbisgis-view/src/main/java/org/orbisgis/view/toc/actions/cui/legends/PnlUniqueLineSE.java
Fix what I broke in the Dash Array
Fix spacing issue by setting number of columns.

We'll eventually need to switch from GridLayout to GridBagLayout.
Clean up (avoid multiple translations)
Merge pull request #456 from agouge/UI

Facelift for certain symbolizer interfaces