0026964: Merge OCAF white-papers into OCAF user's guide

The text of white papers has been rearranged as follows:

OCAF white paper:
  Purpose of OCAF
  Overview of the architecture
  A look inside OCAF
- merged with the Introduction chapter

  Getting Started
  An example of OCAF usage
- added in Samples chapter

  The Data Framework
- merged with Data Framework Services chapter

  Persistent Data Storage
- added as a separate chapter

OCAF function mechanism white paper:
- added as a separate Example of Function Mechanism Usage chapter

Distribution of data through OCAF tree white paper:
- added as "The choice between standard and custom attributes" paragraph in Standard Attributes chapter.