[boost][range] merge from trunk to release

svn path=/branches/release/boost/range/; revision=80677
[range] merge doc fixes (r81888, r81889) from trunk

svn path=/branches/release/libs/range/; revision=82138
[range] merged bug fixes (r81890, refs #5603; r82071, refs #6103) from trunk

svn path=/branches/release/boost/range/; revision=82139
[range] Merge documentation fixes and minor refactoring of docs (refs #5160; refs #5314; refs #5440; refs #5775; refs #6212; refs #7585; refs #7843; refs #7866).

svn path=/branches/release/libs/range/; revision=82487
[range] merge fix for typos in comments to release branch (refs #7916)

svn path=/branches/release/boost/range/; revision=82620
[range] merge documentation fix from trunk (refs #7926)

svn path=/branches/release/libs/range/; revision=82622