Update Designer Users Guide

Various fixes/improvements were made to dialogs, wizards and editors to improve the experience for lower-resolution screens. This included adding scrollbars to panels and re-arranging some panel contents/widgets.

Affected screen caps in http://docs.jboss.org/teiid/designer/9.0/user-guide/en-US/html/ include the following figures.

2.12, 2.13
5.2, 5.7, 5.8, 5.50, (insert a new 5.51) remove 5.52
7.7, 7.9

New Features:
Create Operation action & dialog in Operations Editor tree view: https://issues.jboss.org/browse/TEIIDDES-2513
Generate REST virtual procedures action and dialog: https://issues.jboss.org/browse/TEIIDDES-2454