Merge from trunk, finally.

svn path=/branches/fix-links/tools/jam/; revision=41817
Merge from trunk.

svn path=/branches/fix-links/tools/build/; revision=41865
Merge from trunk.

svn path=/branches/fix-links/tools/jam/; revision=42243
Merge.

svn path=/branches/fix-links/tools/build/; revision=42338
Merge.

svn path=/branches/fix-links/tools/build/; revision=42905
Merge.

svn path=/branches/fix-links/tools/build/; revision=43063
Merge.

svn path=/branches/fix-links/tools/build/; revision=43162
Roll back links to the beta site.

svn path=/branches/fix-links/tools/build/; revision=43163
Merge from trunk.

svn path=/branches/fix-links/tools/build/; revision=43211