[boost] [TR1] Patches for BCB2006

Several TR1 tests are failing due to an old workaround that took swap out of namespace std::tr1. The latest compiler is much more compatibile the the overloads for complex math, so updated that workaround too. There were a few occurrences of the problem where BCB does not allow a leading :: following the typename keyword. These seem to be the exception, rather than the rule, in the files so I simply removed the :: for all compilers, rather than insert another borland workaround. Diffs follow against 1_34_0 branch. OK to commit? [mainline, then merge to branch] -- AlisdairM