0027191: Documentation - redesign of information architecture -- revision (overview...

0027191: Documentation - redesign of information architecture -- revision (overview and samples)

Revision of Introduction, Overview, Samples, Tutorial

- Technical Overview is incorporated into Introduction
- Samples (from Overview) and Tutorial are moved into new section Tutorials and Samples
- Content of Getting Started section (Draw Test Harness and Experimenting with Draw Test Harness) is moved into Tutorial and Samples section.
- Content changes: links to Open Cascade website promoting paid training and support are deleted.
- Some pictures in User Guides (Foundation Classes, Modeling Data, Modeling Algorithms) and Tutorial are updated to improve quality and correct mistakes.