[boost] [1.34.0] [thread] [graph] finish markup sync

I've checked in the attached patches to: 1. Merge changes to required toolset list from RC to HEAD 2. Merge a couple of new test markups fron HEAD to RC. (2) applies to graph and thread libraries. I've verified that the mentioned tests exist on RC; if the library authors believe those changes should not be on RC, just say. I've also moved merged_to_RC_1_34_0 tag on .xml and .xsd files. - Volodya