Simplify install doc dir structure
- Remove r6 directory
- Rename r7 directory to be non release-specific
- Delete unused files
- Delete obsolete include files
- Delete obsolete commented sections in install topics
- Remove redundent version menu entry
Signed-off-by: Ron Stone <ronald.stone@windriver.com>
Change-Id: I59634826d4b3af41410e9d26cc182f6b4aed8ade